一道城牆，必須防守者能夠很容易地上城頭防禦，城內近處必須有值得防衛的東西，如財產、交通要樞... 等等

來源: 海陬觀者於 2018-12-25 13:53:00 [舊帖] [給我悄悄話] 本文已被閱讀：次

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