用英语介绍万里长城

The Great Wall of China (Wanli Changcheng 万里长城; literally "Ten Thousand Leagues Long Fortification") is one of the most outstanding buildings of mankind, sometimes called the eight world wonder and said to be the only human work that can be seen from the moon (which is, of course, not true).
The part of the Great Wall we can admire today north of Beijing, are the reconstructed remnants of the Ming Dynasty wall. But this wall is only the last wall-fortification in a long tradition of wall building.
The oldest fortification walls of China were erected as an instrument of defense between the kingdoms of the Warring States period from the 5th to the 3rd century BC, that means, to defend Chinese against Chinese, not against "barbarians", like later. Today, it is possible to reconstruct five of these inner-China walls: the walls of Qi 齐 (modern Shandong), Chu 楚 (modern Hubei), Qin 秦 (modern Shaanxi), Yan 燕 (modern Hebei), Zhao 赵 (modern Shanxi), and Wei 魏 (mo