She says South Korea is insisting his case be handled according to previous North-South agreements not North Korean law Yu's case is drawing inevitable comparisons to North Korea's detention of two American female journalists who were captured in March.

VOA: standard.2009.06.05

So, in this case, we're just drawing the molecular orbital diagram for the valence electrons, so we have three for each.

所以在这个例子里面，我们只需要画出,价电子的分子轨道图，所以每个有3个电子。

麻省理工公开课 - 化学原理课程节选