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VERB
（作出）反應；回應
When you react to something that has happened to you, you behave in a particular way because of it.
例句
They reacted violently to the news...
他們對這條新聞反應強烈。
It's natural to react with disbelief if your child is accused of bullying...
如果你的孩子被指責欺負了別的孩子，你不相信是很正常的。
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VERB
反抗;不服;反對
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.
例句
She reacted against the mindlessness and luxury of their lives...
她對他們生活的盲目和奢侈很反對。
My father never saved and perhaps I reacted against that.
我父親從來不存錢，我可能正好相反。
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VERB
產生不良反應;過敏
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.
例句
Someone allergic to milk is likely to react to cheese...
對牛奶過敏的人可能對奶酪也有不良反應。
He reacted very badly to the radiation therapy.
他接受放射治療，副作用很大。
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V-RECIP
起（化學）變化;發生（化學）反應
When one chemical substance reacts with another, or when two chemical substances react, they combine chemically to form another substance.
例句
Calcium reacts with water...
鈣和水會發生化學反應
Under normal circumstances, these two gases react readily to produce carbon dioxide and water.
在正常情況下，這兩種氣體容易發生反應產生二氧化碳和水。