失去幽燕16州，北宋没有太行山北部和燕山山脉的屏蔽，易攻难守，开封总是处于危险之中。

来源: 老生常谈12 于 2024-09-02 12:51:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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