investigator
  調查者,審查者;偵查員
  In·ves·ti·ga·tor n.  One who searches diligently into a subject.
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  investigator
       n 1: a scientist who devotes himself to doing research [syn: research
            worker, researcher]
       2: someone who investigates
       3: a police officer who investigates crimes [syn: detective,
          tec, police detective]