gu4
ruo4
jin1
tang1
  1. lit. secure as a city protected by a wall of metal and a moat of boiling water (idiom)
  2. fig. well fortified; invulnerable to attack

Characters

  • 固 (固): hard; strong; solid; sure; assuredly; undoubtedly; of course; indeed; admittedly
  • 若 (若): to seem; like; as; if
  • 金 (金): surname Jin; surname Kim (Korean); Jurchen Jin dynasty (1115-1234)
  • 汤 (湯): surname Tang

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