那裏是阻擋北方南侵的主要屏障，沒了話遊牧民族下來更容易了。

來源: Glider 於 2011-04-12 20:11:43 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.