By regular rate we mean that the amount of time that each chord holds is exactly the same; every chord holds for the same length of time.

如果变化频率规则，那么和声中每个和弦持续的时间长度是完全相同的;,每个和弦都持续同样长的时间。

耶鲁公开课 - 聆听音乐课程节选

What we're working with here are the same chords.

我们现在研究的完全是同一个和弦。

耶鲁公开课 - 聆听音乐课程节选