That's what they do. It's consonant, it's in major, it's high and, most important, the rhythm is very uncomplicated.

这就表现他们的音乐,它是协和的,是大调,是高音,并且最重要的一点,这节奏很是简单

耶鲁公开课 - 聆听音乐课程节选

Optimal sub structure.

简单一点的子问题的最优方案来解决问题。

麻省理工公开课 - 计算机科学及编程导论课程节选