求介绍长城的英语文章

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求介绍长城的英语文章

The Great Wall of China is considered to be the only man-made project visible from the moon.Although it was once thought to have been built entirely during the Qin Dynasty between 221 and 208 BC,it is now believed to have been started earlier.The 15-foot-high,25-foot-wide,1,500-mile-long structure was undoubtedly built to keep out invading enemies.