cat·a·lyst /ˈkætl-ɪst/ ●○○ noun [countableC] 2 CAUSEsomething or someone that causes an important change or event to happen 导致重大变化的事物[人];促进因素catalyst for They hope his election will act as a catalyst for reform. 他们希望他的当选会成为改革的催化剂。
—catalytic /ˌkætlˈɪtɪk◂/ adjectiveadj