固若金湯

gùruòjīntāng ㄍㄨˋ ㄖㄨㄛˋ ㄐㄧㄣㄊㄤ

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

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