1N-VAR (尤指不常出现的)小变化 A perturbation is a small change in the movement, quality, or behaviour of something, especially an unusual change. (尤指不常出现的)小变化 [technical]
...perturbations in Jupiter's gravitational field. [+ in]
木星重力场的微小变化
2N-UNCOUNT (某事引起的)忧虑,不安,烦恼Perturbation is worry caused by some event. (某事引起的)忧虑,不安,烦恼 [formal]
This message caused perturbation in the Middle East Headquarters.