catalyst
noun [ C ] uk/ˈkæt.əl.ɪst/ us/ˈkæt̬.əl.ɪst/
chemistry specialized催化剂
something that makes a chemical reaction happen more quickly without itself being changed
促成变化的人；引发变化的事件
an event or person that causes great change
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。