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impenetrable

英 [ɪm'penɪtrəb(ə)l] 美[ɪm'pɛnɪtrəbl]
  • adj. 不能通过的;顽固的;费解的;不接纳的

考试真题


No system is impenetrable, and none can promise to eliminate the worst case completely.

出自-2016年12月阅读原文