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銅牆鐵壁

From Wiktionary, the free dictionary

Chinese

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copper wall iron wall; rampart
trad. (銅牆鐵壁)
simp. (铜墙铁壁)

Pronunciation

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Idiom

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銅牆鐵壁

  1. impregnable and indestructible wall or barrier
  2. (figuratively) something very firm and indestructible