They reacted violently to the news. [VERB + to]

他们对这条新闻反应强烈。

It's natural to react with disbelief if your child is accused of bullying. [VERB adv./prep.]

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。

'How did he react?' — 'Very calmly.' [VERB adv./prep.]

“他有什么反应？”—“非常平静。”

She reacted against the mindlessness and luxury of their lives. [V against n]

她对他们生活的盲目和奢侈很反对。

My father never saved and perhaps I reacted against that. [VERB + against]

我父亲从来不存钱，我可能正好相反。

Someone allergic to milk is likely to react to cheese. [VERB + to]

对牛奶过敏的人可能对奶酪也有不良反应。

He reacted very badly to the radiation therapy. [VERB to noun]

他接受放射治疗，副作用很大。

Calcium reacts with water. [VERB + with]

钙和水会发生化学反应

Under normal circumstances, these two gases react readily to produce carbon dioxide and water. [VERB]

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。