tracking
  跟蹤;[美](對學生按分軌制進行的)分組
  tracking
  追蹤
  Track, v. t. [imp. & p. p. tracked p. pr. & vb. n. tracking.] To follow the tracks or traces of; to pursue by following the marks of the feet; to trace; to trail; as, to track a deer in the snow.
     It was often found impossible to track the robbers to their retreats among the hills and morasses.   --Macaulay.
  2. Naut. To draw along continuously, as a vessel, by a line, men or animals on shore being the motive power; to tow.
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  tracking
       n : the pursuit (of a person or animal) by following tracks or
           marks they left behind [syn: trailing]