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单词 precursor
释义 precursor
 /pri kerr"seuhr, pree"kerr-/,  n.  
  1. a person or thing that precedes, as in a job, a method, etc.; predecessor.
  2. a person, animal, or thing that goes before and indicates the approach of someone or something else; harbinger: The first robin is a precursor of spring.
  3.  Chem.  ,  Biochem.   a chemical that is transformed into another compound, as in the course of a chemical reaction, and therefore precedes that compound in the synthetic pathway: Cholesterol is a precursor of testosterone.
  4.  Biol.   a cell or tissue that gives rise to a variant, specialized, or more mature form.
 [1375-1425; late ME < L praecursor forerunner. See PRE-, CURSOR]
 Syn. 1. forerunner. 2. herald.
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