To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts.

两个物体的相互作用力总是大小相等，方向相反，同时出现或消失且作用于同一直线上。

youdao

The third essence of "Tao" refers to the mutual actions, mutual influences and mutual relations between all the things in the space with time's elapsing.

“道”之实质之三是指所有万事万物之间与时间、空间的相互作用、相互影响、相互联系。

youdao

Those mutual-fund managers are pretty poor stewards, rarely voting against the actions of executives.

ECONOMIST: Buttonwood

Actions taken by Benedict as Pope have piled fresh resentments on top of centuries of mutual suspicion between Jews and the Church.

BBC: Reflections on Pope's Holy Land tour

At the same time, should conflict escalate, Iran's actions may drive disparate actors, even Gulf Arab states and Israel, to unprecedented collaboration for their mutual defense.

CNN: Can U.S. help Gulf shield itself against Iran?