https://zh.wikipedia.org/w/index.php?title=%E8%B4%9D%E5%8A%A0%E5%B0%94%E6%B9%96
原来苏武牧羊的北海是贝加尔湖,位于西伯利亚,四舍五入就是汉代古拉格 #兔子洞
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