There's an acoustical reason for this.

这里就有一个听觉的因素。

Bhan Lam, an acoustical engineer at Nanyang Technological University in Singapore.

新加坡南洋理工大的声工程Bhan Lam说到。

Fundamental acoustical features including tempo, pitch and timbre seem to be responsible for the similar responses of the Canadians and the Congolese Pygmies.

包括节奏，音高及音色等本的听觉特征看上去对加拿大人和刚果俾格米人有着同样的效果。

As an acoustical phenomenon, an octave is defined as the interval in which the vibrational frequency of the bottom note is half that of the top note.

作一种声现象，八度音阶指的是音程，其中底部音符的震动频率是顶部音符的一半。