orthern invaders. Towards the end of the Ming Dynasty, the Great Wall helped defend the empire against the Manchu invasions. However, when the gates at Shanhaiguan were opened by Wu Sangui, the Manchus quickly seized Beijing and established the Qing Dynasty. Under Qing rule, China's borders extended beyond the walls and Mongolia was annexed into the empire, so construction and repairs on the Great Wall were discontinued.?后来的长城由汉,隋和晋朝以极大的代价来修理,改建或是扩建长城以捍卫自己免于北方的侵略。在15世纪40-60年代,明朝修建了所谓的“辽东长城”。明朝末年,长城抵御了满清帝国入侵。然而,当山海关隘口被吴三桂打开后,满族人迅速占领了北京,建立了清朝。在清朝统治下,中国的边界一直延伸到长城之外和蒙古,所以建造和维修长城的工事被停止。Р月球视野РThe Great Wall is the mightiest work of man, the only one that would be visible to the human eye from the moon. ? -- Richard Halliburton ? 长城是人类最伟大的工程,是唯一可以从月球上直接用肉眼看到的东西。——理查德·哈里伯顿。РMount. LuР2017/10/14Р10
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