Michael Jackson's 50-night run at London's O2 arena was to have set a new course for the entertainer.

VOA: standard.2009.06.26

And what I want to point out that we just figured out for molecular orbital theory, is that o 2 is a biradical, because remember, the definition of a radical is when we have an unpaired electron.

我要指出的是,我们刚利用分子轨道理论，指导了O2是二价自由基，因为记住，自由基的定义是,有个未配对的电子。

麻省理工公开课 - 化学原理课程节选

We put the magnesium 2 plus here, and then we put the oxygen here, O 2 minus, and we know that this gives us our R zero, right?

我们把Mg2+放这，然后O2-放这，我们都知道这给我们的是R0，对么？

麻省理工公开课 - 固态化学导论课程节选