This is the radial probability distribution formula for an s orbital, which is, of course, dealing with something that's spherically symmetrical.

这个ｓ轨道的,径向概率分布公式，它对于球对称,的情形成立。

麻省理工公开课 - 化学原理课程节选

The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.

第二种构成,需要空间非极性,就是需要极性键的空间对称分布。

麻省理工公开课 - 固态化学导论课程节选

Well, the mean is always .2 no matter how many policies you write, so it's going to be--we're going to have a normal distribution centered on .2.

不论你签了多少份保单,均值永远是0.2,所以这就是一个关于x=0.2对称的,正态分布

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Symmetric disposition of polar bonds still results in a nonpolar molecule.

空间对称的极性键分布,还是会导致整个分子为非极性分子。

麻省理工公开课 - 固态化学导论课程节选