B2 to act in a particular way as a direct result of something else反应;作出回应
chemistry to change in a physical or chemical way when put with another substance产生(化学)反应
More examples
It's difficult to gauge how they'll react.
She slapped him and called him names, but he didn't react.
The prime minister reacted angrily to claims that he had lied to the House of Commons.
She reacted surprisingly calmly to the news of his death.
The government was very slow to react to the problem.
verb
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