We can say that a nonpolar molecule you can have as a result of two different conditions.

所以你可以说非极性分子,有两种构成方式。

麻省理工公开课 - 固态化学导论课程节选

Here is the question. Is methane a polar molecule or a nonpolar molecule? Let's look carefully.

问题是，甲烷是一个极性分子还是非极性分子,我们仔细看看。

麻省理工公开课 - 固态化学导论课程节选

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

If we can do that, we'll end up with a symmetric nonpolar molecule.

如果我们能这样做，我们就能得到那些对称非极性的分子。

麻省理工公开课 - 固态化学导论课程节选

And yet, the molecule is symmetric and nonpolar.

所以这个分子是对称非极性的。

麻省理工公开课 - 固态化学导论课程节选

This bond is polar, but again, as I alluded to earlier, because the carbon is centered in the tetrahedron, because of the sp3 hybridization, the molecule itself is symmetric and nonpolar.

这个键是非极性的，但是，我们断言过早，因为C是中心原子，由于sp3杂化，这个分子本身是非极性的且对称的。

麻省理工公开课 - 固态化学导论课程节选