The Okefenokee,which is already nearly choked with plants, would probably fill in,dry up, and become just another cypress and pine forest were it not for range fires that come along every once in awhile and burn out decayed vegetation.

VOA: standard.2010.03.29

what three quantum numbers tell us, versus what the fourth quantum number can fill in for us in terms of information.

三个量子数和,四个量子数告诉我们的信息。

麻省理工公开课 - 化学原理课程节选

Remember, all you have to do is fill in the one or two-letter abbreviation for the chemical symbol.

记住，你们只要,用一两个字母的缩写,来代表化学元素就可以了。

麻省理工公开课 - 固态化学导论课程节选

Let's just first fill in this for the b 2 case.

让我们先填完这个B2的情况。

麻省理工公开课 - 化学原理课程节选