That's a fourth but it happens to produce an octave against that.

这个是四度,但它碰巧产生一个八度音阶,与另一个形成对比

耶鲁公开课 - 聆听音乐课程节选

So we're going to listen now to the end of Strauss's Death and Transfiguration, and again we've got the idea of the octave, then the fifth, then the fourth.

我们下面会,听施特劳斯的死亡与净化直至结束,我们再次了解了八度音阶,然后是第五音阶,第四音阶

耶鲁公开课 - 聆听音乐课程节选

French horn, yeah,but notice that if we take this aggregate-- and we're back to that same idea of the octave,the fifth,the fourth and the third, sort of,so it's again sort of primordial, this particular acoustical basis of so much of music.

法国号，对，但是注意，从总体的角度来看-,我们又回到了八度的概念，第五，第四，第三，大概是这样，所以这依然是是很基础的形式，许许多多音乐都是以这一种形式为声学基础的。

耶鲁公开课 - 聆听音乐课程节选

They filled in the octave up above and then they filled in the fifth and then they filled in the fourth and then they came down a whole step and then they went up a fourth from that whole step and then up a fourth from that, and they were filling in in this fashion.

他们填写了八度音程,然后填写了五度音程,又填写了四度音程,然后下降一个全音级,又从那个全音级上升四度音程,然后再上升四度音程,他们就是照这样填写

耶鲁公开课 - 聆听音乐课程节选