低收入的城乡地区的教师没有参加过数学竞赛，他们可能不知道有像 Math Counts 这样学习高数的机会。

Teachers in low-income urban and rural areas with no history of participating in math competitions may not know about advanced-math opportunities like Math Counts.

youdao

丹麦人口数并未减少可能与丹麦的纳税人自理六个试管授精疗程有很大关系。

That it is not may have something to do with the fact that in Denmark the taxpayer will cover up to six cycles of IVF treatment.

youdao

所有的稀有气体元素的最外层电子数都是该层最大的可能数目：氦的最外层电子有两个，其它的稀有气体最外层电子数是八。这使稀有气体非常稳定。

All noble gases have the maximum number of electrons possible in their outer shell (two for helium, eight for all others), making them highly stable.

youdao

OK, great. So, most of you recognize that there are four different possibilities of there's four different electrons that can have those two quantum numbers.

Ｋ，大部分都认为,有４个不同的可能,有四个不同的电子可以有,这两个量子数。

麻省理工公开课 - 化学原理课程节选

So let's go to a second clicker question here and try one more. So why don't you tell me how many possible orbitals you can have in a single atom that have the following two quantum numbers?

让我们来看下一道题目,你们来告诉我,有多少个可能的轨道,含有这些量子数呢？

麻省理工公开课 - 化学原理课程节选