Although many so-called "new" artists are veteran performers, the rules stipulate they may be considered if they achieved a significant breakthrough during the current eligibility period.

VOA: standard.2010.01.25

But what really happens is as you go on in chemistry, you draw so many of these you can just draw them without following the rules.

但是随着你在化学上的深入，你会画很多路易斯结构,以至于你可以不用管这些规则就能直接画出来。

麻省理工公开课 - 化学原理课程节选

So, our second step, as we go through our Lewis structure rules, is to figure out how many valence electrons we have in our entire molecule.

那么，我们的第二步，按照路易斯结构的规则，应该是判断在整个分子中,包含多少个价电子。

麻省理工公开课 - 化学原理课程节选