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长城高度不足8米 为何能抵御外族2千年?3大真实用途曝
作为世界十大建筑奇蹟之一的万里长城,最早是由秦始皇时代所建造,目的是为了抵御不同时期塞北游牧民族的侵袭,歷代君主也纷纷投入修缮,直到明朝大规模修建,才有了现代人熟悉的明长城。不过长城高度只有7.8公尺,游牧民族只要架上梯子、绳索就能轻易翻越,看似相当 ...
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