失去幽燕16州，北宋沒有太行山北部和燕山山脈的屏蔽，易攻難守，開封總是處於危險之中。

來源: 老生常談12 於 2024-09-02 12:51:21 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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