su·sur·rus /sʊˈsɝəs, ˈsʌrəs/
  低語聲,喃喃低語聲,沙沙聲
  Su·sur·rus n.  The act of whispering; a whisper; a murmur.
     The soft susurrus and sighs of the branches.   --Longfellow.
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  susurrus
       n : the indistinct sound of people whispering [syn: susurration]