react /riˈækt/ vi. 1.反抗，反作用(与against连用)：to react against the opposition(oppression) 反抗对方（反抗压迫） 2. 反应，感应(与to连用)：A dog reacts to kindness by wagging its tail. 狗摇尾巴以报答爱护。Cause and effect react (up) on each other. 原因和结果相互起作用。 3.起化学反应：Acids react on metals. 酸与金属起化学反应。Hydrogen reacts with oxygen. 氢与氧起反应。
reaction /ri(:)ˈækʃən/ n. 1. 反应，反作用（to）：action and reaction 作用与反作用；a nuclear reaction 核反应；evil reaction 不良的副作用［考句］ It was difficult to guess what her reaction to the news would be.很难猜测她对这个消息会有怎样的反应。 2.反动，对抗：forces of reaction 反动力量
reactionary /ri(:)ˈækʃənəri/ n. [c] 反动分子：Down with reactionaries!打倒反动派！‖II. adj. 反动的：The reactionary officer then ordered him arrested.这时反动军官下令把他抓起来。Some of the labour leaders were also questioned by the reactionary police.一些工会领导人也受到反动警察的查问。
