一度唱腔就是指所有的演唱者共同演唱同一个音，没有和声。

Unison singing indicates singing in which all singers sing the same notes, without harmony.

youdao

任何人都很难选择用“棒”来形容我的表现！没有玛瑞娅的吉他和声音引导着我，我的歌完全一团糟。

Great is the last word anyone would choose to describe my performance! Without Mareya's guitar and voice to guide me, my song was completely in a mess.

youdao

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。

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.

youdao

Socrates never says Simmias, here's what your objection goes wrong: harmony is not really invisible or can't be destroyed, whatever it is, so we don't have a counterexample.

苏格拉底从没说过，西米亚斯,你的观点在这里有错,和声并非无形或者不可毁灭，所以我们没有了反例。

耶鲁公开课 - 死亡课程节选

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

If he could show us, he could convince us that harmony is not really invisible, then we would no longer have a counterexample to the claim that the invisible can't be destroyed.

如果他可以说服我们,和声并非无形，那我们就没有了,灵魂不可毁灭,这一论断的反例。

耶鲁公开课 - 死亡课程节选