"We are working on a grassroots level to identify the issues that are going on in the community, and developing and cultivating leaders to take charge of their own communities and really changing the conditions that they find themselves in.

VOA: standard.2010.02.24

These gas ions, if you take gas ions, these gas ions, if you take gas ions, gas ions of opposite charge will necessarily agglomerate without limit.

这些气态离子，如果你得到气态离子的话，如果你得到这些气态离子，具有相反电荷的气态离子,将必然会无限地聚集。

麻省理工公开课 - 固态化学导论课程节选

So, if we want to figure out the formal charge on the carbon, we need to take the number of valence electrons, so that's 4. We need to subtract the lone pair, what number is that? It's 2.

如果我们想算出碳原子的形式电荷，我们需要将价电子的个数，也就是四，减去孤对电子的个数，它是多少？是二。

麻省理工公开课 - 化学原理课程节选