perturbation

柯林斯词典

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]
...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]
This message caused perturbation in the Middle East Headquarters. 这个消息在中东总部引起了不安。