n.反应；反作用力；反动；保守 变形： 复数：reactions 双语释义：n.(名词)[C][U]反应; 回应 (a case or way of) reacting; response[U][C]反作用力 (in science) (a) force exercised by a body in reply to another force, which is of equal strength and acts in the opposite direction[S]回复到以前的状态,复古 a ch