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Jyutping sing4 si4
Pinyin chéng shí

Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

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Jyutping sing6 si4
Pinyin chéng shí

Definitions (Wiktionary)
  1. verb, formal
    to seize an opportunity; to take advantage of timing