speak·er /ˈspikɚ/
 說的人,講演者,喇叭揚聲器


 speaker
 喇叭


 speaker
 揚聲器 喇叭


 Speak·er n.
 1. One who speaks. Specifically: (a) One who utters or pronounces a discourse; usually, one who utters a speech in public; as, the man is a good speaker, or a bad speaker. (b) One who is the mouthpiece of others; especially, one who presides over, or speaks for, a delibrative assembly, preserving order and regulating the debates; as, the Speaker of the House of Commons, originally, the mouthpiece of the House to address the king; the Speaker of a House of Representatives.
 2. A book of selections for declamation. [U. S.]

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 speaker
      n 1: someone who expresses in language; someone who talks
           (especially someone who delivers a public speech or
           someone especially garrulous); "the speaker at
           commencement"; "an utterer of useful maxims" [syn: talker,
            utterer, verbalizer, verbaliser]
      2: electro-acoustic transducer that converts electrical signals
         into sounds loud enough to be heard at a distance [syn: loudspeaker,
          speaker unit, loudspeaker system, speaker system]
      3: the presiding officer of a deliberative assembly; "the
         leader of the majority party is the Speaker of the House
         of Representatives"