Return action or influence; response to influence or effort exerted.

反动；反应。

A tendency to return to a former or opposite state of things.

复原或变成相反之趋势。

The respouse of a living tissue or organism to stimulus or change.

生理上对刺激或改变之反应。

The opposing force exerted on an agent by the body upon which it acts.

【理】反动力；反作用。

The interaction of chemical substances according to their properties, or the result of such action.

【化】化学反应或其结果。