So,first of all,let me assert my firm belief that the only thing we have to fear is fear itself - nameless,unreasoning,unjustified terror which paralyzes needed efforts to convert retreat into advance."

VOA: special.2011.05.19

So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.

让我们继续定义这些常数,我们对这些应该都很熟悉了，首先，我们有质量，m等于。

麻省理工公开课 - 化学原理课程节选

Just let me get you out of here first,all right? It's my dad! We have to go back!

VOA: standard.other