Let's go back to high school for a moment, just by way of background.

让我们回到高中，去寻找一些相关背景。

麻省理工公开课 - 固态化学导论课程节选

All right. With that by the way of background, let's go on to two -what we might call rhythmic devices here--two rhythmic devices.

以此为背景知识,我们来继续学习,两种节奏类型

耶鲁公开课 - 聆听音乐课程节选