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Jyutping zyun3 cuk1
Pinyin zhuàn sù

Definitions (CC-CEDICT)
  1. angular velocity
  2. number of revolutions per minute
Definitions (粵典–words.hk)
  1. 名詞
    物體轉​動​嘅​速度​,​例如​引擎
    rotational speed
Definitions (Wiktionary)
  1. noun
    rotational speed; revolution