react

1. V-I When you react to something that has happened to you, you behave in a particular way because of it. 作出反应

They reacted violently to the news. 他们对这条新闻反应强烈。

2. V-I 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. 反抗

My father never saved money and perhaps I reacted against that. 我父亲从不攒钱，也许我反对这种做法。

3. V-I 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. (对药物或其他所碰触的东西等) 起不良反应

Someone allergic to milk is likely to react to cheese. 对牛奶过敏的人可能会对奶酪也有不良反应。

4. V-RECIP When one chemical substance reacts with another, or when two chemical substances react, they combine chemically to form another substance. 起化学反应

Calcium reacts with water but less violently than sodium and potassium do. 钙能与水产生化学反应但不如钠以及钾那么剧烈。