bourdon
  低音部音塞,低音,最低音的鐘
  Bour·don n.  Mus. (a) A drone bass, as in a bagpipe, or a hurdy-gurdy. See Burden (of a song.) (b) A kind of organ stop.
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  Bour·don n.  A pilgrim's staff.
  bourdon
       n : a pipe of the bagpipe that is tuned to produce a single
           continuous tone [syn: drone, drone pipe]