| 单词 | catalyst |
| 释义 | catalyst /kat"l ist/, n. 1. Chem. a substance that causes or accelerates a chemical reaction without itself being affected. 2. something that causes activity between two or more persons or forces without itself being affected. 3. a person or thing that precipitates an event or change: His imprisonment by the government served as the catalyst that helped transform social unrest into revolution. 4. a person whose talk, enthusiasm, or energy causes others to be more friendly, enthusiastic, or energetic. [1900-05; CATALY(SIS) + (-I)ST] |
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