catalyst

/ˈkætəˌlɪst/

(chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected

中文释义：催化剂；促进因素

Enzymes act as biological catalysts that speed up chemical reactions in cells.

酶作为生物催化剂，加速细胞内的化学反应。

The new policy served as a catalyst for economic growth in the region.

新政策成为该地区经济增长的催化剂。