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impregnable

英 [ɪm'pregnəb(ə)l] 美[ɪm'prɛɡnəbl]
  • adj. 无法攻取的;不受影响的;要塞坚固的;可以受孕的

英英释意


1. able to withstand attack;
"an impregnable fortress"
"fortifications that made the frontier inviolable"
2. impossible to take by storm