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N-VAR
反應；回應；反響
Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it.
例句
Reaction to the visit is mixed...
對這次訪問的反應不一。
The initial reaction of most participants is fear...
多數參與者的最初反應是恐懼。
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N-COUNT
反對;反抗;抵制
A reaction against something is a way of behaving or doing something that is deliberately different from what has been done before.
例句
All new fashion starts out as a reaction against existing convention...
所有新時尚都是從打破現有常規開始的。
Her three years of freedom seemed like a reaction against that childhood.
她那3年的自由仿佛是對孩童時代的反叛。
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N-SING
抵制；抵觸
If there is a reaction against something, it becomes unpopular.
例句
Premature moves in this respect might well provoke a reaction against the reform...
在這方面不成熟的舉動很可能引發對改革的抵觸情緒。
The government response seems to be the result of strong public reaction against the police apathy.
政府的回應似乎是公眾強烈抵制警察冷漠執法的結果。
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N-PLURAL
反應力;應變能力
Your reactions are your ability to move quickly in response to something, for example when you are in danger.
例句
If his reactions are so slow, he shouldn't be in charge of a bus...
如果他的反應太慢，就不應該開公交汽車。
The sport requires very fast reactions.
這項運動要求極快的反應力。
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N-UNCOUNT
保守思想;反動思想
Reaction is the belief that the political or social system of your country should not change.
例句
Thus, he aided reaction and thwarted progress.
因此，他幫助反動派阻撓進步。
...their victory against the forces of reaction and censorship.
他們取得的對保守勢力和審查制度的勝利
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N-COUNT
（化學）反應，變化
A chemical reaction is a process in which two substances combine together chemically to form another substance.
例句
Ozone is produced by the reaction between oxygen and ultraviolet light...
臭氧由氧氣和紫外線發生反應而產生。
Catalysts are materials which greatly speed up chemical reactions.
催化劑是可以大大加速化學反應的物質。
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N-COUNT
過敏;不良反應
If you have a reaction to a substance such as a drug, or to something you have touched, you are affected unpleasantly or made ill by it.
例句
Every year, 5000 people have life-threatening reactions to anaesthetics...
每年有5,000人對麻醉劑產生致命反應。
Common foods which cause this kind of reaction are fish, eggs, and shellfish.
引發這種不良反應的常見食物包括魚、蛋和貝類。