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Jyutping gwaai1 zai2
Pinyin guāi zǎi

Definitions (Wiktionary)
  1. noun, Cantonese
    good boy; well-behaved boy
Definitions (Kaifangcidian)
  1. 好兒子 – 好儿子
  2. 好孩子
  3. 好男孩

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Jyutping gwaai1 zai2
Pinyin guāi zǐ

Definitions (CC-CANTO)
  1. good or well-behaved boy