What's the disadvantages of travelling by air?

优点：有利于团结意识,合作意识,增进人际关系等
缺点：不利于个人发挥.

The 2008 Olympic Games has been held in Beijing,where many sportsmen and sportswomen from the countries all over the world assembled.As everyone knows,holding the Olympic Games is more than a great honor for the country and its people.As to our China,we have tried many times to get a opportunity for hosting it,finally,we do.However,hosting the Olympic Games has not only advantages but also disadvantages .
As for advantages,hosting the Olympic games will have a positive effect on the economy.With millions of foreigners coming to the country to see the Olympic Games,they will consume,for example,they eat foods in restaurants,live in hotels.Second,the Olympic games creates more job opportunities for local workers,as Olympic games ususlly requires a standard of the gymnasiums for the sport games,so there will be more building needed.In addition,through the Olympic Games,more people around the world will know the country who hosted it.
But there are still some disadvantages.As more and more people flood into the country,its environment may be damaged to some extent.Besides,confilcts may increased with so many people who have different nationalities and the colors of skin at the same time.

ones指的是 advantages

21.C 22.A 23.C 24.D 25.A 26.B 27.C 28.C 29.D 30.A

B

B

the biggest advantage:
easy to find the answers to finish your homework
the biggest disadvantage:
too easy to find the answers to build your own mind
作业最好自己做.:(

the advantages and disadvantages of plastic surgery(美国人写的）（我)
despite its expensiveness,plastic surgery makes you look more better.sometimes we feel awkward to look the way we are.if your getting plastic sergery,be prepared for admirers followers,and probably a bunch of wannabes.
but there are many disadvantages to plastic surgery too.you might want to make your small nose a little bigger,but then you think it turned too big.you change the rest of your face larger and its bigger than the normal ratio again.at the end ,you have a giant face,and no money.there are also risks,because the operation may not succeed,resolving in nauseating uglyness
if you ask me,i suggest you stay away from plastic sugery.

花明天的钱的坏处

反正我睡不着觉...keke
我刚好是广州的,2010看我们的吧!keke
The Disadvantages and Advantages In Guangzhou Asain Games
As to the question whether Guangzhou should have bidden for the Asian Games,people have different ideas.People who are for the bid say that it is a right thing to do,for the holding of the game can raise the city’s fame in the world,provide a chance to improve the city’s construction,and provide jobs at the same time.However,people who are on the other side have their reasons.They think holding the game brings a lot of trouble to the citizen’s life,and it costs a lot of money in improving the infrastructure,while many of the sport facilities will remain vacant after the game.
In my opinion,it is a wise decision to bid for the game.I think holding the game will benefit the city and its citizens a lot in the long term.So let’s do what we can to make the coming game the best game ever.
Together we can make it!Together we can do a better job!

生活在城市有着与生俱来的好处和坏处.通常更容易找到工作.有很多公共交通方式可供选择.另外,有很多有趣的事情可以做,有很多有趣的地方可以看.你可以在好的餐馆里吃饭,参观博物馆,去看电影,去公园,只要是你想放松一下的时候.然而生活在城市成本通常很大,你必须找到一个高回报的工作,否则,你将不能支付起你要做的事.而且,城市通常非常邮寄,嘈杂和脏乱.很难找到一个人们可以享受宁静的生活和乡村特有的新鲜空气的地方.

翻译准确

有疑问请追问

谢谢!

Sales promotions are vital for businesses who desire to increase sales and interest in the company.When used moderately with careful planning,sales promotions increase sales even after the promotions are finished.When they are used too regularly,the excitement or urgency around them wears off.
Advantage--Create Urgency
Sales promotions draw attention to a particular product or service being offered.They distinguish a business from competitors through pricing.Dryden Sales,explains that when sales promotions are offered for a limited time,it creates urgency among the customers because they have to act before the promotion expires.As a result,the limited offer reduces the time customers have to think about the product.In most cases,they will stop comparing the alternatives and buy the featured item or service.
Advantage--Keep Trade Flowing
Keeping stock flowing between distributors and retailers is an advantage of sales promotions.This pertains to commodities that have a certain shelf life,as well as items that don´t.For the business it means that stocks are replenished regularly with items that have recently been made.It also encourages distributors to buy more of the items and ensure that they always have adequate supplies,states Dryden Sales.Quite often,suppliers/distributors buy items according to how often they sell out of a commodity.Therefore,if sales of an item are particularly slow,than distributors/suppliers are less likely to buy that item regularly,meaning the potential to run out of it is greater.
Disadvantage--Message Miscommunication
As with most sales promotions,either the distributor or the business offering the product are not profiting as much as previously.It is a calculated risk,but one that needs to be planned and handled carefully to be truly effective.Sales promotions are usually advertised to inform customers of the special offer.If there is a discrepancy between what's published and the real offer,than it will be viewed negatively by the public,states HKTDC.Retailers and distributors must ensure that whatever promotion is being published is honored or the special offer will work against the company,possibly tarnishing its reputation.
Disadvantages--Price Sensitivity
Promotions in sales are a disadvantage when they are offered too regularly.The key to making them successful is offering them irregularly,catching the customer off guard and unprepared.If they are provided too regularly then they create price sensitivity among customers.Dryden outlines price sensitivity as intentional waiting by customers to purchase items only when they are promoted in a sale,rather than buying them at the regular retail price.Profits decrease.

The advantages and disadvantages of cars.
汽车的优点和缺点
Nowadays more and more families own private cars.Private cars,as the product of modem civilization,have been playing a vital role in people's daily activities.First,private cars are a convenient means of transportation.You can go wherever you like.Secondly,there is no doubt that private cars will have a great impact on the economic growth.The rapid car industry growth will contribute much to keeping the country's economy growing at a higher rate in the near futrue.But every coin has two sides.The development of the private cars will bring about a series of problems.For example,the polluted air given off by cars will do great harm to our health,too many private cars will lead to traffic jams and a great deal of energy will be wasted and so on.So I think we should take advantages of private cars and make them serve us better.Meantime we hope that satisfactory solutions to these negative problems will be found soon.现在,越来越多的家庭拥有私家车.私家车作为现代文明的产物,在人们日常生活中扮演了重要的角色.首先,私家车是很方便的交通工具,你可以开车到处跑；其次,毫无疑问私家车对经,济的增长起到很大的作用.在不远的将来,快速发展的汽车工业在保持国家以较高速度的增长方面将做出很大的贡献.当然,任何事物都有其两面性.快速发展的私家车会导致一系列问题.例如,汽车排出的废气对人体有很大的伤害,太多的私家车会导致交通阻塞,很多能源被浪费等.所以我认为我们．应当充分利用私家车的优势,更好地为我们服务.同时,我们也希望不久这些消极的问题将会得到圆满的解决.

在你的家乡生活有什么好处和不好的方面,哈哈,你根据实际情况自己整几句就行了.

Mobile phones have become more and more popular in China these days.Wherever you go,you can see people using mobile phones.Many high school students,even primary school students,have mobile phones.
Mobile phones have brought people a lot of benefits,but the most important is that they are convenient.With mobile phones,they can keep in touch with anybody they want.If they want to get some information from the Internet,they can easily have their dream realized through mobile phones too.Furthermore,if someone has a heart attack or a traffic accident,an emergency call to hospital or to the police can quickly bring him help he wants.
However,mobile phones can also bring people problems.The most serious is the electric wave radiation which is thought to be harmful to users' brains.Another problem is that when people are having a meeting or a class,the ring of the mobile phone may interrupt others.So I think people should use mobile phones as little as possible and turn them off when they are attending an important meeting or a class.

To be exact,there are many disadvantages in plastic surgery.For example,most plastic surgery cost much,many people can't afford to it.What's more,such changes may bring about unexpect disarsers in the future.Some even have dangerous side effect and may threaten one's life.Often one's movement will be limited after finishing plastic surgery.If yoiu have prosthesesed your nose,you shoud be carefull when you want to kiss somebody.

A

考查词组辨析。Appeal to 吸引，呼吁 object to 反对 refer to 参考，涉及 turn to 向某人求助
句意为尽管网游有缺点，但是他们从来都能吸引大量的青少年。

chatting
of介词 后面跟名词或doing.

Many people have started to go abroad for their holidays so that they can be more adventurous and visit more unusual places.
There are several advantages to going abroad.First of all,you can choose a country where you can be more certain of good weather,and you can follow particular interests and
hobbies which may not be possible in your own country,such as scuba diving or wildlife holidays.In addition to this,you can learn about foreign countries and foreign cultures.Also you can practise your foreign language skills.
However,going abroad has some disadvantages.Although you can choose a country with better weather than your own,you may come into contact with unusual illnesses that your body is not used to.While you can follow particular interests and hobbies,you may not be able to speak the language of the people you meet who share your interests.What is more,even though you can learn about foreign cultures,you may find it difficult to adapt to these cultures,for example,attitudes to women may be different and difficult to accept.
In conclusion,personally,despite the disadvantages I prefer taking holidays abroad because they are an opportunity to leave your own country and think and learn more about the world.

advantages and disadvantages of jumping from job to jobas the developing of the ecnomic and science,our society is progressing.and we should pay more in order to meet our needs.so it is commonly that ...

with the development of science and technology, more and more work needs computer,but the computer has advantages and disadvantages, we can use computer to do somethings which we don't want to d...

D

句意：就薪金而言，这个工作倒是挺不错的，但也有一些不利之处。in terms of意思为“谈及；就……而言；在……方面”，符合题意。other than意思为 “除了……之外”，相当于except；except for意思为“除……之外”，用于所言不包括的人或事物前；in view of意思为“鉴于；考虑到；由于”，表示原因。

你是咋那么翻译的?我是这样翻译的 养这样的宠物有什么好处和坏处?两个是并列的关系不是选择关系

Traveling has many advantages.When the holiday is coming,many people come to some places of interest.That may bring the econmy fast increasing.By traveling.we can also relax ourselves,then maybe we can do our work better.
It also has some advantages,for example,it may cause some traffic problems,for more people use the transportation during the journey.
Such is just my opion,but I think traveling is good.

网上找作文,用有道查读音,接着就是跟着背就行

错误已经如下用——显示
From the international perspective——From the international perspective
of foreign language——of a foreign language——of at least one foreign language
a your superiority——a necessity
through a cut- throat competition——in nowadays' fierce competition (cut throat太血腥)
Therefor——therefore
From my own experience——in my opinion更好一些
make them confused——cause them some confusion
the language points are out the range of their understanding——part of the learning process,for example, grammar studying, might be beyond their depth
adapt the language earlier.——get use to a new language as early as possible
children really need a synchronous development between native language and foreign language. ——it is good for chilren to develop their abilities to use a foreign language along with their mother tongue.
more powerful memories——stronger memories
greatly impressive in their mind——deeply ompressive to them
They will not forget even if they are old.——they will remember for a life time
Moreover, learning foreign language becomes more efficient to them. ——这句话重复上文意思,不知目的何在
Normally——Generally
They(指代不明） do not have too much pressure, but secondary school students oblige to turn their attention to other subjects, for instance, physics, biology, geography and so on.——The former do not have too much pressure, while secondary school students are boliged to turn their attention to other subjects, for instance, physics, biology, geography.
disadvantage——复数
租后一句总结有问题,因为本文并没有提到缺点,只是说了优点,故不合题意.
建议楼主多读多背课文,增强语感.错误什么的不是关键,关键是英语对你来说仍然全然陌生.

其实练口语最主要是发音是否标准,一般的小培训机构根本没有办法提供纯正的美式英语,你可以去百度搜
一下英腾英语,它的课程是美国那边录制的,内容都很有意思,日常用语对话多一下,都是视频、幻灯
片音频这种形式的课程,而且是比较纯正的美式英语,课程里有个speaking lab的智能语音分析系统
,就是你跟读的句子直接就能够反映到电脑屏幕上,而且还会分析出你和美语原声在语速,语调,音波
上的差别在哪,并且连读音这种细节都可以分析出来,很直观.而且也不用浪费时间去培训机构,借助
电脑和网络就可以了.

Searching for a job is not necessarily easy.Therefore it is good to prepare yourself a little bit and make up your mind about what kind of company you want to join.There are two basic types:You can either apply for a job in a big company or in a small company.Both have advantages and drawbacks.
The smaller companies are usually ignored by potential employees,who focus their efforts more on large firms that have name recognition.However,during tough economic times,small firms are actually better positioned to hire in the period of recession.Small businesses may have a business plan more progressive than big companies,so they are able to succeed despite poor economic situation.What is more the small firm may not have the large overhead or the extra employees that big companies might have added during the last period of economic growth.Another advantage of working in small firms is that the work roles are often less specialized allowing employees to interact with staff in more functional areas and to get a better view of operations.Since employees and their work results are more visible,it is often easier to advance in a smaller organization.Employees often gain experience in a variety of areas,giving them multiple skills and areas of expertise to add to their resume.These small employers may also have more flexibility to consider alternative work arrangements like flextime or job sharing.On the downside,smaller employers may have fewer formal training programs,benefit packages can be more restricted,and opportunities to relocate to other branches may be more limited or non-existent.There might be less opportunity for growth and promotion,and the failure rate for small firms is also much higher than for larger ones.In addition the small company’s resources are almost always very limited.Furthermore little companies suffer from mistakes more than the big ones.Although there could be less job stability than at a bigger company,if the comfort level fits and you enjoy the job,working for a smaller company could be a good choice to get your career started.On the other side we have the big firms that also have advantages and disadvantages.The main advantage that most of us pay attention to most is the salary,which is usually higher than in the small companies.In addition the big companies are probably well known you can proud to work for an international company.

优点远大于缺点!

题目是：乘坐公共交通工具旅行有哪些优点或缺点?
这个问题我高三时也写过.
你的作文意思是：目前,我们的生活离不开公共交通.当我们去上学或上班时,我们通常采取做公交车和地铁的方式.我们使用它们是因为它们都非常方便,安全.但其实是不舒服的.因此,我认为开我们自己的汽车旅行更方便,舒适.公共交通十分缓慢.我们年轻,所以我们不能浪费任何时间.
At present,we can not live without public transport.When we go to school or work,we usually take the bus and subway to do way.This is because they give us the convenience and security.However,this is uncomfortable.Because a lot of people by bus,car is very crowded,and delays on the way a lot of time.On the contrary,if we are to open your own car travel will be more convenient and comfortable.
As the saying goes,"a coin has two faces."Take public transport vehicles to fulfill their advantages and disadvantages!Therefore,we can take different situations to take a different approach.
仅供参考,也许也有语法错误,能力有限了.不知道你们的评分标准,自己选合适的内容改吧!

Advantage:So Many Boys
Disadvantage:none is handsome

The advantages and disadvantages of travelling 【By Kaiser3344】
Advantages：
　　If you stay in places for a reasonable length of time,you can learn about other cultures,gain an appreciation of the world's diversity and how others live and perhaps learn new positive practices that you can bring home with you.
　　It is good for the jobs and economy of the place being visited because people come and spend money there.However,if the tourism is high impact and unsustainable it will be damaging to the economy further down the track when the area is not as pristine.
Disadvantages：
　　It involves a lot of consumption of fossil fuels.Aeroplanes use heaps of fuel and cause lots of air pollution.Then you will often use buses,cars,trains etc when you get there.Big hotels,swimming pools etc have a negative impact on the local environment from wastes and pollutants produced,altering the local ecology,using water resources,using energy.
　　The best kind of tourism I think is one where you are not doing the high pace sight seeing hotel to hotel,bus,taxis,airports etc,but where you spend a while in the one spot,camping or staying with a family,go for bushwalks,doing WWOOFing (willing workers on organic farms,google it if interested),low impact type tourism.Go to places nearer to where you live - they can be just as amazing!
【楼主】若不满意或不符合现今水平,请继续追问!

然而 作业也有不利的方面
首先,作业需要大量的时间和精力,所以学生们没有时间做他们的爱好或空闲时间的活动.更重要的是,许多学生抱怨作业是无聊的,因为他们必须做同样的事情又再次前进.
再有不懂的 就问我 !

这哪儿的作文题目啊 真没新意

what sort of question is that?I'm confused.

As the latest information shows,thousands upon thousands people are rushing into big cities to settle down.I think that people who immigrate to big cities must enjoy the advantages of city life.I am certainly a supporter among them.Living in a big city,shopping centers,restaurants and recreation centers are always within easy reach.Therefore,it's very convenient to buy various commmodities.In addition,the residents in big cities can participate in political and cultural activities more often than those who living in the country.
However,crowded big cites are being confronted with many problems.The most severe ones are "Traffic jam","housing condition","pollution".All of these public hazards take a toll on big city's "health".Hence,we should pay high attention to environmental issues and public utilities.Only in this way can we live in a great comfort as citizens through all eternities.

The Advantages and Disadvantages of Internet
The following aspects could best illustrate the advantages of Internet. Netsurfers in different countries can share interesting knowledge and the latest information. Besides, Internet has provided a major opportunity to buy and sell merchandise . What is more, people may get medical help or even vote on Internet. Its advantages seem countless.
Behind all this glowing talk, however, are some problems. Internet makes people passive by stopping them making their own entertainment. So much so that when there is a breakdown or jam, people may find that World Wide Web turns into World Wide Wait. What is worse, some children have access to the scenes of violence and sex. Apart from these, it can be affected by viruses and hackers.
We should handle its problems, meanwhile we should exploit its potential as well. With proper management of Internet people ought to experience more fruits of the information revolution. All the wisdom of the ages, all the information that has enlightened mankind for centuries, should be available to us with the healthy development of Internet.

advantage:
Live in a new environment
Promoting culture
Improve the language skill and communication skill
Better for the next generation
disadvantage:
not easy for both family to be reunion
need spend more time to communicate and understand,tolerance etc.
high commute fare

肯定能,因为你写得很好.good!

对某人不利:
If you don't speak good English,it'll be at a big disadvantage to you when try to get a job.
你要是英语讲得不好,找工作时就会处于非常不利的地位.

5.6分 此文章比较中规中矩,模板痕迹不重,高分词汇短语不多
dangerouses->dangerousness,
also will->will also,yoth->youth
choise->choice
there be的单复数根据后面的名词决定 这点在文章中多次用错
worth这个词的用法要搞清才可以用 文章中多次用错
first,the disadvantages.这句话过于口语化 写作需要完整的句子
too many examples are there应改成there are too many examples 这个新东方老师特意强调过
举对成人的缺点时应用现在时而不用过去时
建议：你已掌握基本的写作技巧,但基础薄弱,最好巩固一下单词和语法
附：worth,worthy,worthwhile 区别
1.worth adj&n.值得,应该,作形容词在句中只能作表语
①sb./sth.be worth ...:
His words are worth notice.他的话值得注意.
The bike is worth 200 yuan.
②be (well) worth doing (很)值得做...,注意这个句型是主动表被动的用法,如这本书值得一读
This book is worth reading.
2.worthy adj&n.有价值的,值得...的,做形容词时既可以做表语又可以作定语
①be worthy of +n.
He is worthy of our praise.
②be (quite)worthy of being done (很)值得做...:
The film is worhty of being watched.
③be worthy to be done (很)值得做...,上面的句子可以改写为:
The film is worthy to be watched.
3.worthwhile adj.值得做的..值得出力的,既可以做表语又可以作定语
be worthwhile doing/be worthwhile to do:
It is worthwhile discussing the question again.=It is worthwhile to discuss the question again.

楼上的的发的好长啊,厉害!
The Advantages and Disadvantages of Internet
The following aspects could best illustrate the advantages of Internet.Netsurfers (网上冲浪者) in different countries can share interesting knowledge and the latest information.Besides,Internet has provided a major opportunity to buy and sell merchandise (商品).What is more,people may get medical help or even vote on Internet.Its advantages seem countless.
Behind all this glowing talk,however,are some problems.Internet makes people passive by stopping them making their own entertainment.So much so that when there is a breakdown or jam,people may find that World Wide Web turns into World Wide Wait.What is worse,some children have access to the scenes of violence and sex.Apart from these,it can be affected by viruses(病毒) and hackers (黑客).
We should handle its problems,meanwhile we should exploit its potential as well.With proper management of Internet people ought to experience more fruits of the information revolution.All the wisdom of the ages,all the information that has enlightened mankind for centuries,should be available to us with the healthy development of Internet.

ADVANTAGES:

1. Once a dam is constructed, electricity can be produced at a constant rate.
2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high.
3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades.
4. The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right.
5. The lake's water can be used for irrigation purposes.
6. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity.
7. When in use, electricity produced by dam systems do not produce green house gases. They do not pollute the atmosphere.




DISADVANATGES:

1. Dams are extremely expensive to build and must be built to a very high standard.
2. The high cost of dam construction means that they must operate for many decades to become profitable.
3. The flooding of large areas of land means that the natural environment is destroyed.
4. People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.
5. The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earth’s surface at its location.
6. Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.
7. Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighbouring countries.
8. Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from ‘rising damp’ caused by the changing water table level.

In my case, the disadvantages totally outweigh the advantages of living with them.
Disadvantages:
First of all, I need to pay them rent and split the utility and grocery bills with them. (don't even think about freeloading!)
Second, I cook, I wash the dishes, I vacuum the carpet, I do the laundry, I take out the garbage.
Third, they always criticize me and nag.
Fourth, arguing and conflicts are inevitable.
Advantages:
First, you can save on your phone bill cuz you don't need to make long distance calls to them.
Second, you see them everyday so you won't miss them or feel lonely.

There are many advantages about our school education.Firstly,students are strictly trained and they thus have many ways of developing their knowledge.Besides,they are close with thier students and so they can foster their friendship with others.

的利与弊长期以来人口的主题讨论中经济学家观点供给的优良土地是有限的养活一个人口众多,较低的土地必须培养和良好的土地集中工作因此,每个人产生少了,这意味着更低,比本应达到的平均收入人口较少其他经济学家说,大量的人口给更多的机会专业化的发展和设施,例如港口、道路和铁路公司不可能建立除非有大需求证明它们.

the advantages of Internet is very obvious:at first,Internet can serves as a communicative tool in our modern society .By Internet ,the communication among people are more covenient than ever before .What its more ,we can find many useful information we need on the internet.And more importantly ,we can make many new friends from all over the world by surfing on the internet.
But,each coin has two sides.Internet also has some disadvantages.For example,school student ,may spend a long time on computer games,and they will fall behind in their studies.And besides,there are many deceitive informations on the Internet.So people sometime may be get cheated.

Advantages of computer:
Computer has made a very vital impact on society.It has changed the way of life.The use of computer technology has affected every field of life.People are using computers to perform different tasks quickly and easily.The use of computers makes different task easier.It also saves time and effort and reduces the overall cost to complete a particular task.
Many organizations are using computers for keeping the records of their customers.Banks are using computers for maintaining accounts and managing financial transactions.The banks are also providing the facility of online banking.The customers can check their account balance from using the internet.They can also make financial transaction online.The transactions are handled easily and quickly with computerized systems.
People are using computers for paying their bills,managing their home budgets or simply having some break and watching a movie,listening to songs or playing computer games.Online services like skype or social media websites are used for communication and information sharing purposes.
Computer can be used as a great educational tool.Students can have access to all sort of information on the internet.Some great websites like Wikipedia,Khan’s Academy,Code Academy,Byte-Notes provides free resources for students & professionals.
Moreover,the computer is being used in every field of life such as medical,business,industry,airline and weather forecasting.
Disadvantages of computer:
The use of computer has also created some problems in society which are as follows.
-Unemployment:
Different tasks are performed automatically by using computers.It reduces the need of people and increases unemployment in society.
-Wastage of time and energy
Many people use computers without positive purpose.They play games and chat for a long period of time.It causes wastage of time and energy.Young generation is now spending more time on the social media websites like Facebook,Twitter etc or texting their friends all night through smartphones which is bad for both studies and their health.And it also has adverse effects on the social life.
-Data security
The data stored on a computer can be accessed by unauthorized persons through networks.It has created serious problems for the data security.
-Computer crimes
People use the computer for negative activities.They hack the credit card numbers of the people and misuse them or they can steal important data from big organizations.
-Privacy violation
The computers are used to store personal data of the people.The privacy of a person can be violated if the personal and confidential records are not protected properly.
-Health risks
The improper and prolonged use of computer can results in injuries or disorders of hands,wrists,elbows,eyes,necks and back.The users can avoid health risks by using the computer in proper position.They must also take regular breaks while using the computer for longer period of time.It is recommended to take a couple of minutes break after 30 minutes of computer usage.
-Impact on environment
The computer manufacturing processes and computer waste are polluting the environment.The wasted parts of computer can release dangerous toxic materials.Green computer is a method to reduce the electricity consumed and environmental waste generated when using a computer.It includes recycling and regulating manufacturing processes.The used computers must be donated or disposed off properly.

Advantage
There is no doubt that since the mobile phone has come to this world and the world become smaller than before ,peoplecould use it to contact to others and even to the world,and two lovers could also to sending message to each other,the could to show their love by this way,and it maybe means the perment just like the worth necklace.
Disadvantage
Also,it is not diffcult for us to find something bad form the mobile phone.
Everyone knows it could have a thing which contains a iol of radioactivity,needless to say it is bad for our health,but it is not the most important,the most important disadvantage about it is if the students who have had it will use it to play phone games on class or even where the are,so we know it could forced them not to study hard,and at last their parents will very worried about it bu it is already too late.