北京长城约有多少千米?

Labor Day， the first Monday in September， is a creation of the labor movement and is dedicated to the social and economic achievements of American workers. It constitutes a yearly national tribute to ...

各位游客：
大家好!欢迎大家到八达岭景区观光旅游.今天有幸陪同大家一起参观,我很高兴,望各能在八达岭度过一段美好的时光.
长城是世界闻名的奇迹之一,它像一条巨龙盘踞在中国北方的辽阔的土地上.它是中国古代劳动人民血法的结晶,也是中国古代文化的象征和中华民族的骄傲.
游客们,我们已经来到了著名的八达岭长城,您向远处看,可以发现这里的长城分为南、北两峰,蜿蜒于山脊之上,龙腾虎跃、气象万千,景色十分壮观.往下面看是有两个门洞和U字形的城墙缎怕谳瓮城.在瓮城墙上内外两面都有垛口墙,四面拒敌.倘若敌人攻破关门涌入城内,将受到四面守城将围歼,敌人如落瓮中.瓮城是长城的一个重要组成部分.它一般都建在地形险要的交通要道上.八达岭的瓮城也不例外.建在山脊上,受地形限制,依山就势,东低西高,东窄西宽,仅有5000平方米.瓮城内无井,水源缺乏,平常驻兵不多,守城部队驻在西北三里的岔道城.瓮城中原有一座“察院公馆”,是供皇帝路过驻跸或官员停留住宿的.瓮城两门之间相距63.9米,西门楣题额“北门锁钥”,它的用意我在前面已经讲过.城门洞上,古进安装有巨大的双扇木门,门内安装有木顶柱和锁闩.平时,大门敞开,行人商旅自由出入；战时城门紧闭,严实坚固；一旦发出反击号令,城门洞又是千军万马发起冲锋的出口.瓮城的东门楣题额为“居庸外填”,修建于明嘉靖十八年.在“居庸外镇”关城的城台上,原来嵌有一块石碑,为明朝万历年间刻制.从碑文可以看一带长城,先后经80多年时间才完成.这碑中还记录着修筑长城的时间、长度、主持官和管工头、烧头、窑匠头、泥瓦匠头和名字,以明确责任.站在城上向下看,我们中以看到来往不断的车辆和从门洞穿过的游人.这里不仅是古代重要的军事防御关口,而且也是交通要道.从这里南通昌平、北京,北去延庆,西北往宣化、张家口,“路从此分,四通八达”.八达岭也因此得名.
我们往右下方看,在登城口的南侧陈列着一门大炮,名为“这时威大将军”.这门炮炮身长2.85米,口径105毫米,由于中炮身上铸有“敕赐神威大将”而得名.字最大的射程是500多米,可见当时的军工业是比较发达的.
北8楼是八达岭长城海拔最高的楼,高达888.9米,建筑也很有特色.原来还可登上敌楼观山望 景,但目前为了保护文物封了楼门.
从关城城台到南峰的最高处南4楼,城墙长685.8米,高度上升142.4米,特别是南3楼至南4楼之间,山脊狭窄,山势陡峭,长城逶迤400多米.城顶最险处,坡度约为70度,几乎是直上直下.南1楼和南2楼,都没有修复二层,从南3楼遗存的柱础看,原来也有铺房.
南峰长城以南4楼地势最高,海拔803.6米.登楼眺望,长城自西南向东北蜿蜓于山脊之上,宛如苍龙,宏伟壮观.使人不由得想起我国著名的长城专家罗哲文先生登临八达岭长城时咏的诗；千峰叠翠拥居庸,山北山南处处峰.锁钥北门天设险,半哉峻岭走长龙.从南4楼到南7楼,高度逐渐下降.南5楼与南6楼之间在长城的内侧距城墙30米的山脊上,耸立着一座白色的小亭,这就是1987年6月落成的“贵州省修复长城纪念碑亭”.南6楼是一座铺房,铺房建在上层的顶上,面阔三间,硬山顶,红柱子,灰色瓦,小巧玲珑.这大概是当年“千总”的指挥所.
结尾:
今天的长城,早已失去军事价值,而以其特有的魅力,吸引着广大中外游客,成为举世闻名的旅游胜地.随着旅游业的发展,长城这一中华民族的象征,全世界重要的文化遗产,会焕发出新的生机.以更优质的旅游服务、更优美的旅游环境迎接着大家的到来!

I am so eager to visit the Great Wall all the time.To my delight,now my dream will come ture because our family are planing to climb the Great Wall this weekend.We are going to Beijing by train and going back by plane.And we will stay there for two days.Of cause,I surely will take some beautiful picture during our visit.Also,my mother want to take some food and drinking,and we are busy with preparing for it at the moment.I hope we could have a good time in Beijing!

提示的单词,短语捏
真懒
Dear editor,
I Spent my last vacation happily．
some day I went to visit the GREAT WALL with my parents.The long trip made us very tired, but the sight of the beautiful scenery refreshed us.
When I was lost in admiration of the pretty scenery,I saw there was someone carving some words on the GREAT WALL.
I felt so furious that he destroied Chinese welth .As we know,there are also many foreigners,what he did has damage Chinese image.
I write this letter to you and hope you could ppublish it to appeal everyone ,we must protect our culture welth and stop hurt it
best wishes.
大概就是这些了
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Dear Editor
Summer time is always the best time for people to have some leisure; many would go to some places of interest,but in my recent trip to the Great Wall,I witnessed..答案有字数限制?搞笑

历朝历代大众汗水铸造的雄伟工程,是世界上的一个伟大奇迹.