perturbation
noun uk/ˌpɜː.təˈbeɪ.ʃən/ us/ˌpɝː.t̬ɚˈbeɪ.ʃən/
(WORRY)
[ U ] formal担心；烦恼
worry
(CHANGE)
[ C or U ] physics specialized摄动;扰动
a small change in the regular movement of an object
Perturbations in the orbit of the planet Uranus led to the discovery of Neptune in 1846. 天王星轨道的摄动使人们于1846年发现了海王星。