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。
2
Polar conversion function is one theoretical question of organic response, study relevant knowledge of polar conversion.
极性转换作用是有机反应中的一个理论问题，本文系统地介绍了极性转换的相关知识。
3
If you ever question why they (the bi-polar person) do or say or feel something because you can't understand, this actually might answer some of those questions!