以前交通不發達，武器落後，必須定都北方。定都南方，信息就比較閉塞，一旦北方遊牧民族入侵，就不好及時決策。

來源: 衡山老道於 2024-06-08 19:03:57 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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