perturbation /ˌpɜːtəˈbeɪʃən/

• 1. 

  N-VAR A perturbation is a small change in the movement, quality, or behaviour of something, especially an unusual change. (尤指不寻常的)小变化 [技术]

  例：

  ...perturbations in Jupiter's gravitational field.

  ...木星重力场的微小变化。

• 2. 

  N-UNCOUNT Perturbation is worry caused by some event. 忧虑; 不安 [正式]

  例：

  This message caused perturbation in the Middle East Headquarters.

  这个消息在中东总部引起了不安。