Because of pollution,however, the amounts are higher the closer you get to cities and towns.

VOA: special.2009.06.09

So, if I kind of circle where the probability gets somewhat substantial here, you can see we're much closer to the nucleus at the s orbital than we are for the p, then when we are for the d.

我把概率,很大的地方圈出来，你们可以看到在ｓ轨道上,比ｐ轨道更接近原子核，最远是ｄ轨道。

麻省理工公开课 - 化学原理课程节选

Because, if you look at this molecule, you say that, well, the electrons are a little bit closer to the right than to the left so the charge is not uniformly distributed.

因为，你看到这分子时，因为，你看到这分子时,对更偏向右边,它的电荷一定不是均匀分布的。

麻省理工公开课 - 固态化学导论课程节选