by ship同义词

应该填saying
因为of是介词,介词后面的动词要使用动名词（+ing)形式

y bike(骑单车),by plane（搭飞机）,on foot（走路）,by car（坐车）,by train（坐火车）,by ship（坐大船）,by bus（坐巴士）,by boat（坐小艇、小船）

y boat=in a boat
by ship=on a ship
总体原则是：
boat、train等交通工具如果前面有冠词、代词（如this、that等）,则表示某一个具体的轮船、火车等等,这是前面不能用by,而要用on或者in.如果没有冠词或代词,则表示一种抽象概念,不是某个具体的车或者船,前面用by.
在表示具体某交通工具时,有甲板（board)的大型交通工具（如轮船、bus、火车、飞机等）用on,而其他如boat(小船）,car等则用in.
当然,boat有时也可以指大船,这时用on.
另外,bike也用on:by bike=on a bike

How did you go to England?

坐轮船,乘船；航运

People enjoy (加上enjoy更好 )travelling by plane,by train,by ship (or) by bus.To me,the best way of traveling (on改为in) a summer vacation is to go on foot.
　　My preference depends on the purpose of the travel.In（On改为In） a summer vacation I travel to refresh myself and to see the countryside.When I use my feet and walk on the grass covering（covered改为covering,作定语）the path along a river or among the hills ,I feel detached from the noise of the city and close（closer改为close） to （the删去） nature.And when I travel on foot I get more freedom.I can plan my own schedule.I can choose my own routes（routes用复数）.I can stay（stop改为stay） where I like.And I can see things and people that I might miss if I travel on a train or on a bus.
　　When faster and more convenient ways for travel are becoming available,I still favour using my own feet.I get much pleasure from it.People travel by plane,by train,by ship or（加上or） by bus.To me,the best way of traveling in（on 改为in）a summer vacation is to go on foot.
文章写得很通顺,流畅.个别弊端以改正.供你参考,

“by sea" is another way of saying (say)"by ship"
what are the differences (different) between the two means of transportation?

1. take a ship
类似的表达还有：take a ship（乘轮船）,take a plane（乘飞机）等.
2. on a ship
on a plane 乘飞机 (可想像“骑”在飞机上)...9. on a ship 乘轮船...10. on a bicycle, on a motorbike 骑自行车/摩托车
3. by ship
by bus 乘公共汽车 fly a kite 放风筝...by ship 乘轮船...by plane 乘飞机
4. take a boat
take a bath 洗个澡（沐浴）...take a boat 乘轮船...take a bus 坐公共汽车