因為假想敵來自塞外，泰半憑借馬匹移動，所以長城的牆高適能阻擋騎兵的進犯，並不作敵軍用機械裝置攻城的準備。

來源: 海陬觀者於 2019-10-20 11:49:17 [舊帖] [給我悄悄話] 本文已被閱讀：次

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