Over here in the lower left corner, we have elements that as a group have very low values of average valence electron energy.

在底层的左侧角落，我们看到以组为单位的,价电子能较低的元素。

麻省理工公开课 - 固态化学导论课程节选

So let's listen to a little bit of this music and I want you, maybe as a group to tap with your foot, your hand whatever, just the beat as you hear it.

我们一起来听一下,我希望你们也许以组为单位,一起用脚打拍,拍手,随你喜欢,一起打拍子

耶鲁公开课 - 聆听音乐课程节选