equivocator
  說模稜話的人,說話支吾的人
  E·quiv·o·ca·tor n. One who equivocates.
     Here's an equivocator that could swear in both the scales against either scale, yet could not equivocate to heaven.   --Shak.
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  equivocator
       n : a respondent who avoids giving a clear direct answer [syn: hedger]