rationalist
  理性論者,純理論者,理性主義者
  Ra·tion·al·ist, n.  One who accepts rationalism as a theory or system; also, disparagingly, a false reasoner. See Citation under Reasonist.
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  rationalist
       adj : of or relating to or characteristic of rationalism;
             "rationalist philosophy"
       n : someone who emphasizes observable facts and excludes
           metaphysical speculation about origins or ultimate causes
           [syn: positivist]