mouth·piece /-ˌpis/
  發話筒,代言人,電話筒對嘴的一端
  Mouth·piece n.
  1. The part of a musical or other instrument to which the mouth is applied in using it; as, the mouthpiece of a bugle, or of a tobacco pipe.
  2. An appendage to an inlet or outlet opening of a pipe or vessel, to direct or facilitate the inflow or outflow of a fluid.
  3. One who delivers the opinion of others or of another; a spokesman; as, the mouthpiece of his party.
     Egmont was imprudent enough to make himself the mouthpiece of their remonstrance.   --Motley.
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  mouthpiece
       n 1: a part that goes over or into the mouth of a person; "the
            mouthpiece of a respirator"
       2: an acoustic device; the part of a telephone into which a
          person speaks
       3: a spokesperson (as a lawyer) [syn: mouth]
       4: (especially boxing) equipment that protects an athlete's
          mouth [syn: gumshield]
       5: the tube of a pipe or cigarette holder that a smoker holds
          in the mouth
       6: the aperture of a wind instrument into which the player
          blows directly [syn: embouchure]