It was a knee-jerk reaction on her part.

这是她未加思索做出的反应。

《牛津词典》

The knee-jerk reaction to this is to call for proper security in all hospitals.

对此类状况的第一反应是要求所有医院都采取相应的安全措施。

《柯林斯英汉双解大词典》

This, however, would be a knee-jerk reaction to a subtle argument.

然而，这将是对微妙争论的下意识反应。

youdao

The same goes for the knee-jerk denunciations of the Watchmen prequels, too, or the knee-jerk hatred of the film adaptations of his work, for that matter.

FORBES: Alan Moore Is Wrong About 'Before Watchmen'

Personally, I would really like to see more umpire consultations after a close call rather than the knee jerk reaction for instant replay.

FORBES: The Plight of The Umpires And The Inevitability Of Instant Replay

You are bound to keep0 being inundated with clarion calls for QE3 as the knee jerk policy needed to stabilize the stock market and prevent further job losses.

FORBES: The Wishful Thinking Department of the U.S.A.