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Jyutping gam1 sing4 tong1 ci4
Pinyin jīn chéng tāng chí

Definitions (Wiktionary)
  1. phrase, idiomatic
    firm city; strongly-fortified city
    (syn.) 金湯, 金汤
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    金城汤池
    金城湯池
    jīn chéng tāng chí
    • strongly fortified city