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 (modern Henan).

The Great Wall is the world's longest human-made structure, stretching over approximately 6,400 km (4,000 miles)[3] from Shanhaiguan in the east to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia, but stretches to over 6,700 km (4,160 miles) in total.[4] It is also the largest human-made structure ever built in terms of surface area and mass. At its peak, the Ming Wall was guarded by more than one million men.[5] It has been estimated that somewhere in the range of 2 to 3 million Chinese died as part of the centuries-long project of building the wall.