con·nois·seur /ˌkɑnəˈsɚ/
  鑑識家,鑑定家,內行
  Con·nois·seur n.  One well versed in any subject; a skillful or knowing person; a critical judge of any art, particulary of one of the fine arts.
     The connoisseur is =\“one who knows,” as opposed to the dilettant, who only “thinks he knows.”\=   --Fairholt.
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  connoisseur
       n : an expert able to appreciate a field; especially in the fine
           arts [syn: cognoscenti]