octave [ˈɑ:ktɪv]

例句:

• The sequence ends with a violently plunging octave figure.
  来自NEWYORKER
• to play an octave higher
  再奏高一个八度
  
• Her voice went down an octave.
  她的嗓音下降了八度.
  
• European music happens to use a scale of eight notes, hence the use of the term octave.
  欧洲音乐凑巧采用了八音音阶，“八度”一词就由此而来。
  
• It can only follow it's own Octave steps.
  来自SA
• My father told me what Octave was looking for.
  来自NEWYORKER