... (可做屏障的险要地方) a place of strategic importance 插头；塞: plug 塞 (他州): sevier county, uta ...
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Ningxia is a place with strategic importance, and ever since ancient times, it was regarded as the main section of the Silk Route.
自古以来就是西北要塞，是丝绸之路北线的重要组成部分。
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