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Jyutping gam1 sing4
Pinyin jīn chéng

Definitions (Wiktionary)
  1. noun, literary
    impregnable city
  2. name
    Jincheng (an urban township in Kinmen, Fujian, Republic of China)
Examples (Wiktionary)
  1. Mandarin
    金城汤池
    金城湯池
    jīn chéng tāng chí
    • strongly fortified city