据DePaulo所说，声音的变化有着非凡的意义。

According to DePaulo, changes in voice can be significant.

youdao

有喉结的人都知道，喉结的生长与声音的变化是同步的。

As people with Adam's apples know, the growth of this structure is associated with a change in voice.

youdao

木材密度的变化会影响振动，因此也会影响声音。

Variations in wood density affect vibrations, and therefore, sound.

youdao

Maybe you can put the frequency of the higher pitches as high so you can detect the sound quicker and That's it exactly.

大概是把频率调到更高的音高后,就能更敏捷地感觉到声音的变化,而那就是原因了

耶鲁公开课 - 聆听音乐课程节选

So we'll focus on the bass and we'll try to sing the bass, and if we find that in singing the bass our voice is not changing, probably the harmony hasn't changed.

现在把我们的注意力放到低声部上，尽量唱出低声部，如果在唱的过程中我们觉得自己的声音没有变化，那和声就很有可能没有改变。

耶鲁公开课 - 聆听音乐课程节选