EPISODE · May 28, 2020 · 5 MIN
博言地理课-中国古代的军事威胁为何多来自北方？
from 博言地理课-5分钟了解地理小知识
中华民族的历史，也是一部对北方游牧民族入侵的抗争史。那为什么步入近代以前的两千多年中，对中原威胁最大的军事压力来自北方，而不是东、西、南三个方向呢？走进本期《博言地理课》，我们去一探究竟吧！
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博言地理课-中国古代的军事威胁为何多来自北方？
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