dem·on·stra·tor /ˈdɛmənˌstretɚ/
 論證者,證明者,指示者,示威者


 dem·on·stra·tor /ˈdɛmənˌstretɚ/ 名詞
 示教者,示教器,示教板


 Dem·on·stra·tor n.
 1. One who demonstrates; specif. (a) one who proves anything with certainty, or establishes it by indubitable evidence. (b) one who shows how a certain device operates or a procedure is performed.
 2. Anat. A teacher of practical anatomy.

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 demonstrator
      n 1: a teacher or teacher's assistant who demonstrates the
           principles that are being taught
      2: someone who demonstrates an article to a prospective buyer
         [syn: sales demonstrator]
      3: someone who participates in a public display of group
         feeling [syn: protester]