The reason there are three quantum numbers is we're describing an orbital in three dimensions, so it makes sense that we would need to describe in terms of three different quantum numbers.

我们需要，3个量子数的原因,是因为我们描述的是一个，三维的轨道，所以我们需要，3个不同的量子数,来描述它。

麻省理工公开课 - 化学原理课程节选

How do we know this always stops? I mean, I ran three trials here, and it did. But how would I reason about, does this always stop?

我指的是我在这儿试了三次，它都停了，那这是为什么呢？,它总是会停下么？

麻省理工公开课 - 计算机科学及编程导论课程节选

every individual consists of three parts, of appetite, spirit, and reason.

每个个体都由三个部份所组成，欲望，意志与理性。

耶鲁公开课 - 政治哲学导论课程节选

And I mentioned three reason why we want to shift this pendulum despite the fact that there are rising levels of depression around the world, on college campuses in United States,China,Australia,UK.

我提过三个原因,关于为什么要改变这个比率,尽管世界上越来越多人抑郁，遍布美国，中国，澳大利亚，英国所有大学。

哈佛公开课 - 幸福课课程节选

I assume what Socrates means by that is though each individual will, each of us, embody all three features of soul, appetite, spirit, and reason, only one of these will be the dominate trait in each of us.

我假定苏格拉底是指,虽然每个个体，我们每一个人，都将体现灵魂,欲望，意志与理性的全部三种特质，而仅有其中一项,会主宰我们每一个人。

耶鲁公开课 - 政治哲学导论课程节选