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国外有哪些像中国函谷关虎牢关潼关这样的著名的关隘？ - 知乎
source link: https://www.zhihu.com/question/266289136/answer/700312541
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以Cumberland Gap为代表的的阿巴拉契亚山脉小道。Gap是豁口、缺口的意思，Cumberland Gap可以翻译成“坎…
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