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固若金汤

impregnable; invulnerable to attack; well-fortified

Frequency 2.5

Meanings

  • lit. secure as a city protected by a wall of metal and a moat of boiling water (idiom)
  • fig. well fortified; invulnerable to attack

Example sentences

  • 城堡的防卫系统固若金汤，难以攻破。