If one chord holds twice as long or only half as long, then we have an irregular harmonic change--irregular rate of harmonic change.

如果某一个和弦持续的时间是其他和弦的两倍或者只有一半，这就是不规则的和声改变。

耶鲁公开课 - 聆听音乐课程节选

He's trying to relax us here by slowing down the rate of harmonic change here.

他希望通过减慢泛音的变化速度让大家在这里快要睡着了。

耶鲁公开课 - 聆听音乐课程节选

So what's happened to the rate of harmonic change here?

所以说这里的和声变化率是怎样的？

耶鲁公开课 - 聆听音乐课程节选

The rate of harmonic change has slowed down considerably here.

泛音的变化速度减得相当慢。

耶鲁公开课 - 聆听音乐课程节选

I want to make one other point before we launch into that, and that is the following: that composers use the rate of harmonic change-- whether it's changing or not changing-- to sort of make us feel different ways about the music that we are listening to.

在此之前我还要说一个问题，不管和声有没有改变，作曲家都能通过和声改变的频率-,让我们对所听的音乐有不同的感受-,它能让我们感受到这段音乐。

耶鲁公开课 - 聆听音乐课程节选