react

verb

1. 起反应；（对…）作出反应；回应
   to change or behave in a particular way as a result of or in response to sth
   1. Local residents have reacted angrily to the news.
      当地居民对这一消息表示愤怒。
   2. I nudged her but she didn't react.
      我用胳膊肘捅了她一下，可她没有反应。
   3. You never know how he is going to react.
      你根本不知道他会作何反应。
   4. The market reacted by falling a further two points.
      股市的反应是再下跌两个百分点。
2. （对食物等）有不良反应，过敏
   to become ill/sick after eating, breathing, etc. a particular substance
   1. People can react badly to certain food additives.
      人们对某些食品添加剂会严重过敏。
3. 起化学反应；发生化学变化
   to experience a chemical change when coming into contact with another substance
   1. Iron reacts with water and air to produce rust.
      铁和水及空气发生反应产生铁锈。

1. VERB （作出）反应；回应
   When you react to something that has happened to you, you behave in a particular way because of it.
   1. They reacted violently to the news...
      他们对这条新闻反应强烈。
   2. It's natural to react with disbelief if your child is accused of bullying...
      如果你的孩子被指责欺负了别的孩子，你不相信是很正常的。
   3. 'How did he react?' — 'Very calmly.'
      “他有什么反应？”——“非常平静。”
2. VERB 反抗;不服;反对
   If you react against someone's way of behaving, you deliberately behave in a different way because you do not like the way they behave.
   1. She reacted against the mindlessness and luxury of their lives...
      她对他们生活的盲目和奢侈很反对。
   2. My father never saved and perhaps I reacted against that.
      我父亲从来不存钱，我可能正好相反。
3. VERB 产生不良反应;过敏
   If you react to a substance such as a drug, or to something you have touched, you are affected unpleasantly or made ill by it.
   1. Someone allergic to milk is likely to react to cheese...
      对牛奶过敏的人可能对奶酪也有不良反应。
   2. He reacted very badly to the radiation therapy.
      他接受放射治疗，副作用很大。
4. V-RECIP 起（化学）变化;发生（化学）反应
   When one chemical substance reacts with another, or when two chemical substances react, they combine chemically to form another substance.
   1. Calcium reacts with water...
      钙和水会发生化学反应
   2. Under normal circumstances, these two gases react readily to produce carbon dioxide and water.
      在正常情况下，这两种气体容易发生反应产生二氧化碳和水。

1. But the country has been slow to react to the 'greening' of the rest of Europe.
   但是，该国却迟迟没有像欧洲其他国家一样提高环保意识。
2. He tended to react in a heated and impetuous way.
   他往往反应过火，急躁冲动。
3. I honestly don't know how I will react the next time I meet a potentially dangerous situation
   我真不知道下次再碰上有潜在危险的情况时会作何反应。
4. I don't react anymore when opponents try to niggle me
   对手找茬惹我时，我不会再理他们。
5. Nations react strongly to unauthorized overflights.
   各国对未经授权的飞越领空行为都会作出激烈反应。
6. It's hard to predict how a jury will react
   很难预测陪审团将会作出何种反应。
7. Primitive humans needed to be able to react like this to escape from dangerous animals
   原始人必须要能作出这样的反应以逃避危险的动物。
8. They reacted violently to the news
   他们对这条新闻反应强烈。
9. It's natural to react with disbelief if your child is accused of bullying
   如果你的孩子被指责欺负了别的孩子，你不相信是很正常的。
10. My father never saved and perhaps I reacted against that.
    我父亲从来不存钱，我可能正好相反。
11. Someone allergic to milk is likely to react to cheese
    对牛奶过敏的人可能对奶酪也有不良反应。
12. He reacted very badly to the radiation therapy.
    他接受放射治疗，副作用很大。
13. Under normal circumstances, these two gases react readily to produce carbon dioxide and water.
    在正常情况下，这两种气体容易发生反应产生二氧化碳和水。
14. He could react rather jealously when and if another child comes on the scene
    如果别的孩子也加入其中，他可能会表现得相当嫉妒。
15. There'd be no telling how John would react to such news as this.
    还不知道约翰听到这样的消息会作何反应。
16. Peonies react badly to being moved and are best left undisturbed.
    牡丹花不宜挪移，最好别去动它。
17. I mean what I say and shall never react from [ go back on] my words.
    我讲话是算数的，决不反复。
18. They will react with ammonia to form amidines.
    它们与氨反应形成脒。
19. How did he react to your suggestion?
    他对你的建议反应怎么样？
20. How you react often dictates how they will respond to those failures.
    你的反应往往决定了了他们将如何回应这些失败。
21. I knew you would react like this.
    我就知道你会有这个反应。
22. I did not react, but I think I am good.
    我也没有反应，可我认为我很好。
23. The zirconium can react with water to produce zirconium oxide and hydrogen.
    锆可以和水反应，产生氧化锆和氢气。
24. Pinch me and I will react.
    你要掐我我就有反应。
25. I knew they'd react the same way you are.
    我知道他们会和你反应一样。
26. Something happened to you, and now you are going to react to it.
    重要的不是你身上发生了什么事，而是你对发生的事情所做出的反应。
27. Something has to make you react.
    有东西让你有反应了。
28. Different people react with the world in different ways and this happens according to peoples'different mentalities.
    不同的人对世界有不同的反应方式和这是根据人的不同心态而产生的。
29. They did not react to this provocation.
    他们对这一挑衅未作反应。

react against sb/sth

1. 反对；反抗
   to show dislike or opposition in response to sth, especially by deliberately doing the opposite of what sb wants you to do
   1. Local residents have reacted angrily to the news.
      当地居民对这一消息表示愤怒。
   2. I nudged her but she didn't react.
      我用胳膊肘捅了她一下，可她没有反应。
   3. You never know how he is going to react.
      你根本不知道他会作何反应。
   4. The market reacted by falling a further two points.
      股市的反应是再下跌两个百分点。

verb

1. undergo a chemical reaction
   1. The hydrogen and the oxygen react

2. show a response or a reaction to something

   Synonym:    respond

3. act against or in opposition to
   1. She reacts negatively to everything I say

   Synonym:    oppose