资料来源 : pyDict

追踪者,描图者,誊写员

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Tracer \Trac"er\, n.
   1. A person engaged (esp. in the express or railway service)
      in tracing, or searching out, missing articles, as
      packages or freight cars.

   2. An inquiry sent out (esp. in transportation service) for a
      missing article, as a letter or an express package.

Tracer \Tra"cer\, n.
   One who, or that which, traces.

资料来源 : WordNet®

tracer
     n 1: an investigator who is employed to find missing persons or
          missing goods
     2: an instrument used to make tracings
     3: (radiology) any radioactive isotope introduced into the body
        to study metabolism or other biological processes
     4: ammunition whose flight can be observed by a trail of smoke
        [syn: {tracer bullet}]