先看一下这句英语有啥语病，另外帮我断一下这句英语句子。（断句）

It winds its way from west to east, across deserts, over mountains, through valleys till at last it reaches the sea.

主要是后面半句 （谢谢大家咯^ ^)

It winds its way from west to east, across deserts, over mountains, through valleys /till at last it reaches the sea.

没错

at last 放错了 应该放在后面。 till it reachs the sea at last at last 怎么能直接放到连接词后面 要么在连接词前面 要么中间有一个连接的语句

感觉at last 可以删去

没有语病, 是介绍长城的.

意思:　它穿过沙漠，越过高山，跨过山谷，由西到东蜿蜒曲折，最后到达大

The Great Wall

The Great Wall runs across North China like a huge dragon, It winds its way from west to east, across deserts, over mountains, through valleys till at last it reaches the sea. It's the longest wall on the earth, also one of the wonders in the world. The Great Wall has a history of more than 2000 years. The first part was built during the Spring and Autumn Period. All the walls were joined up in Qin Dynasty.All tile work was done by hand. Thousands of people died while building the wall.Thus the Great Wall came into existence. Since then, it has been rebuilt and repaired many times. Now the Great Wall,the admiration of the world, has taken on a new look. It's visited by large numbers of people from all parts'of the'country and the world. 长城 长城，像一条巨龙横亘华北地区，它穿过沙漠，越过高山，跨过山谷，由西到东蜿蜒曲折，最后到达大海。它是地球上最长的墙，也是世界奇迹之子。 长城有2000多年的历史。它开始修建于春秋时期。秦朝时，所有的城墙联结在一起。所有工作都是用手完成的，成千上万的人在修建长城时死去。长城就是这样出现的。 目前为止，长城重修多次。现在的长城面貌一新，迎接来角全国和全世界各地的游客。