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TOEFL IELTS BNC: 8852 COCA: 7915

specialized chemistry something that makes a chemical reaction happen more quickly without itself being changed催化剂

an event or person that causes great change促成变化的人;引发变化的事件

The high suicide rate acted as a catalyst for change in the prison system.高自杀率促成了监狱系统的改革。

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