collaborator
  合幹者,合作者,共同研究者
  col·lab·o·ra·tor n.
  1. An associate in labor, especially in literary or scientific labor.
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  collaborator
       n 1: someone who assists in a plot [syn: confederate, henchman,
             partner in crime]
       2: someone who collaborates with an enemy occupying force [syn:
           collaborationist, quisling]
       3: an associate who works with others toward a common goal;
          "partners in crime" [syn: cooperator, partner, pardner]