There are things that we can all relate to, so just because it is set in that era or in this mythological world or even a million years into the future, any movie that is worth its salt in this kind of genre should reflect issues that we deal with today.

VOA: standard.2010.04.08

Are we all set? Back up.

都就位了,往后退

耶鲁公开课 - 古希腊历史简介课程节选

Because we have paired set in a 2 s orbital, so all we're left essentially is two electrons that are available for bonding.

因为我们有一对，在2s轨道里已经配对了,所以只剩下两个电子可以用来成键。

麻省理工公开课 - 化学原理课程节选