On an Africa trip last month, Clinton met with women and girls raped and otherwise abused by soldiers and irregular forces in the conflict in the eastern part of the Democratic Republic of the Congo,the DRC.

VOA: standard.2009.09.25

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