catalyst

1. N-COUNT You can describe a person or thing that causes a change or event to happen as a catalyst. 催化劑

I very much hope that this case will prove to be a catalyst for change. 我非常希望這件事終將成為促成變化的催化劑。

2. N-COUNT In chemistry, a catalyst is a substance that causes a chemical reaction to take place more quickly. 催化劑