If you take a look at the last day, or the day before, you will see that we talked about average valence electron energy.

如果你注意到昨天或者前天的事，你将看到,我们讨论的是平均价电子能。

麻省理工公开课 - 固态化学导论课程节选

I'm going to post PowerPoints for all the lectures, hopefully at least the day before the lecture takes place, so I posted this last night.

我会把课程所有的幻灯片挂到网上,希望至少在上课的前一天完成这件事,因此我昨天晚上把今天的幻灯放上来

耶鲁公开课 - 生物医学工程探索课程节选