長城上麵是平坦的路麵，可以便於行軍，有城堞可以暫時防備草原來的騎兵的突然襲擊。所以才會修建成那種形式。

來源: 海陬觀者於 2018-12-25 13:59:42 [舊帖] [給我悄悄話] 本文已被閱讀：次

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