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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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更新时间:2024/11/12 4:26:28