reaction/rIˋækʃən; riˈækʃ$n/n 1 [C,U] something that you feel or do because of what has happened to you or been said to you [→ response] 反应: +to What was his reaction to the question? 他对问题是什么反应?The news brought an angry reaction from the unions. 这一消息引起了工会的愤怒。My first reaction was to run away. 我的第一反应就是逃走。2 [C] a bad effect, such as an illness from food that you have eaten or from a drug that you have taken〔食物﹑药物等引起的〕不良反应﹔过敏反应: Some people have a very bad reaction to peanuts (=peanuts make them ill). 有些人吃花生会有严重的过敏反应。+to She had a severe allergic reaction to the drug. 她对这种药有严重的过敏反应。3 reactions [plural 复数] BrE the ability to move quickly when something dangerous happens suddenly [ reflexes ]【英】〔险情突发时的〕反应能力: a driver with quick reactions 反应灵敏的司机4 [singular 单数] a change in people's attitudes, behaviour etc that happens because they disapprove of the way in which things were done in the past〔态度﹑行为等的〕改变﹐抗拒: +against a reaction against his strict upbringing 对他严格的教育方式的抗拒5 [C,U] technical a change that happens when two or more chemical substances are mixed together【术语】化学反应CHAIN REACTIONgut reaction at 见 GUT1