北京的英文介绍

重新修改了一下：
The Great Wall at Badaling
The Great Wall was the greatest manmade military defense structure in ancient China. Its construction started during Ancient Spring and Autumn Period and the Warring Stated Period (770-221 B.C.) At that time, walls were built by some warring states to protect their own territories. In 221 B.C., Qin Shihuang, who became the first emperor of a unified China, linked the separate walls into a ¡°ten-thousand-li wall¡± to defend against invaders from the North. From then on, the Great Wall was continuously extended and repaired by following dynasties. Most of wall has deteriorated badly; at present, the best preserved is the wall built in the Ming Dynasty (1368-1644)).
The Ming Dynasty Wall stretches from the Yalu River in Liaoning Province in the east to Jiayuguan Pass in Gansu Province in the west, a length of more than 6,000 kilometers. It runs through 5 provinces, 2 autonomous regions and 2 municipalities in the Northern C