We'll then take a turn to talking about the periodic table, we'll look at a bunch of periodic trends, including ionization energy, electron affinity, electronegativity and atomic radius.

然后我们再开始讲元素周期表，我们会看到很多周期性规律，比如电离能，电子亲和能，电负性以及原子半径。

麻省理工公开课 - 化学原理课程节选

They are talking out of turn, they are throwing paper.

他们口无遮拦，把纸张扔得满天飞。

I get so upset 课堂 - SpeakingMax英语口语达人