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Jyutping sing1 cuk1
Pinyin shēng sù

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

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Jyutping seng1 cuk1
Pinyin shēng sù

Definitions (Wiktionary)
  1. noun
    velocity of speed
    (syn.) 音速