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Jyutping gaan2 haai4 wan6 dung6
Pinyin jiǎn xié yùn dòng

Definitions (CC-CEDICT)
  1. simple harmonic motion (in mechanics)
  2. motion of a simple pendulum
Definitions (Wiktionary)
  1. noun
    simple harmonic motion
    (syn.) 简谐振动, 簡諧振動