So, there's the melody up above, this bassoon playing the counterpoint, kind of in the middle, and then the bass playing these notes quietly underneath.

然后,旋律在上面,这支巴松管来演奏对位,基本上在中间,而低音提琴在底下悄悄地演奏这些音符

耶鲁公开课 - 聆听音乐课程节选

We're singing below middle C and the ladies are singing up an octave but that's still monophonic texture-- those notes have the same names.

我们唱得比中央c低,而女士们高了一个八度,但这还是单音织体,这些音的音名是一样的

耶鲁公开课 - 聆听音乐课程节选