fortress

fortress
noun
  1. a military stronghold, especially a strongly fortified town fit for a large garrison
    要塞;堡垒
    ■a heavily protected and impenetrable building
    堡垒般的建筑
    ■(figurative)a person or thing not susceptible to outside influence or disturbance
    (喻)不受外界影响(或干扰)的人(或事)
    he had proved himself to be a fortress of moral rectitude.
    他已证明自己是坚定不移的公正廉洁之士。
语源
  1. Middle English: from Old French forteresse 'strong place', based on Latin fortis 'strong'
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