铜墙铁壁

Traditional (Taiwan): 銅牆鐵壁

tóngqiángtiěbì ㄊㄨㄥˊ ㄑㄧㄤˊ ㄊㄧㄝˇ ㄅㄧˋ

    • copper wall, iron bastion (idiom) impenetrable defense

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Synonyms and antonyms

Synonyms 近义词

Sources