n.八音度；倍频程
Can you span an octave on the piano? 乍能按到钢琴的八个键吗？
These notes are an octave apart. 这些音相距八度.
Each successive noise function you add is known as an octave. 每个你所叠加的噪声函数就是一个倍频。
八(音)度
