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BNC: 24447 COCA: 19948

perturbation

noun
/ˌpɜːtəˈbeɪʃn/
/ˌpɜːrtərˈbeɪʃn/
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  1. [uncountable] (formal) the state of feeling anxious about something忧虑;不安;烦恼 synonym alarm
  2. [countable, uncountable] (specialist) a small change in the quality, behaviour or movement of something摄动;微扰;扰动;小变异
    • temperature perturbations温度的些微变化
  3. Word Originlate Middle English: from Latin perturbatio(n-), from the verb perturbare ‘disturb greatly’, from per- ‘completely’ + turbare ‘disturb’.

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