固若金汤 (固若金湯) gù ruò jīn tāng

gù ruò jīn tāng set phrase secure as a city protected by a wall of metal and a moat of boiling water; well fortified
Domain: Idiom 成语 , Subdomain: , Concept: City 城市
Notes: (CC-CEDICT '固若金湯')

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