He cannot afford health care. So he comes regularly to this free clinic run by the Inner City Muslim Action Network, also known as IMAN.

VOA: standard.2010.03.15

Because that will take care of all of the electrons that are capable of reacting, none of the inner shell electrons.

因为那样我们可以考虑到,除内层电子以外，所有可以发生反应的电子。

麻省理工公开课 - 固态化学导论课程节选