com·men·ta·tor /-ˌtetɚ/
  評論員,注釋者
  Com·men·ta·tor n.  One who writes a commentary or comments; an expositor; an annotator.
     The commentator's professed object is to explain, to enforce, to illustrate doctrines claimed as true.   --Whewell.
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  commentator
       n 1: an expert who observes and comments on something [syn: observer]
       2: a writer who reports and analyzes events of the day [syn: reviewer]