so·nor·i·ty /səˈnɔrəti, ˈnɑr-/
  響亮,響亮程度
  So·nor·i·ty n.  The quality or state of being sonorous; sonorousness.
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  sonority
       n : having the character of a loud deep sound; the quality of
           being resonant [syn: plangency, resonance, reverberance,
            ringing, sonorousness, vibrancy]