Glycine, alanine, valine, leucine are all nonpolar assets and this is how you drop them in an exam.

甘氨酸，丙氨酸，缬氨酸，亮氨酸全都是极性的，这就是你服考试的秘诀啦！

But water does not dissolve non-ionic, nonpolar substances.

但水不溶解离子、极性物质。

So the methane molecule becomes nonpolar as a result of that.

所烷分子因此变得极性。

So this one's nonpolar, and, of course, this one's nonpolar.

所这个是极性的，当然，这个是极性的。

Therefore, these simple hydrocarbons are pretty nonpolar and their electrons are distributed evenly over the molecule, which is why, you know, oil and water don't mix.

因此，这些简单的碳氢化合物是极性的，它们的电子均匀分布在分子上，这就是油和水不混合的原因。

In this video, we're going to see how we figure out whether molecules are polar or nonpolar and also how to apply that polarity to what we call intermolecular forces.

在本视频中，我们将了解确定分子是极性的还是极性的，及将极性应用于我们所谓的分子间作用力。