So one last concept that I want introduces is this idea of resonance.

我要介绍的最后一部分内容,是共振态这个概念。

麻省理工公开课 - 化学原理课程节选

I wanted to talk about one last concept and this is one the boxes from Chapter 5 and you've already been using this in your homework.

我想说的最后一个概念,就是第五章里的一节,你可能已经在作业里用到了

耶鲁公开课 - 生物医学工程探索课程节选