react

动词 react:

1. show a response or a reaction to something
   同义词：respond
2. undergo a chemical reaction; react with another substance under certain conditions
3. act against or in opposition to
   同义词：oppose

1. Iron reacts with water and air to produce rust.
   铁与水和空气起化学反应而生锈。
2. She reacted to the insult by turning her back on him.
   她受辱之后就不再理睬他了。
3. How did they react to your suggestion?
   他们对你的建议有什么反应？
4. An acid can react with a base to form a salt.
   酸可以和碱起反应而生成盐。

re.act

v.intr.（不及物动词）
re.act.ed,re.act.ing,re.acts
To act in response to or under the influence of a stimulus or prompting:
反应，作出反应：在某种刺激或提示的影响下或针对这种影响而采取的行动：
例句：
reacted strongly to the sarcastic tone of the memorandum.
对于备忘录所使用的讽刺性口吻而作出强烈反应

To act in opposition to a former condition or act:
背离，反其道而行：以与以前条件或行为相反的方式行动：
例句：
composers who reacted against romanticism.
背离浪漫主义的作风家

To act reciprocally or in return.
反作用：相对地或还原性作用
Chemistry To undergo a reaction:
【化学】 起化学作用：产生化学反应：
例句：
Methane reacts with hydroxyl to produce formaldehyde.
甲烷与羟基反应生成甲醛