The towers cost $2,200 to set up, but very little to operate.

VOA: standard.2010.05.25

So when you operate on the wave function, what you end up with is getting the binding energy of the electron, and the wave function back out.

所以当你将它作用于波函数时，你得到的是电子的结合能,和后面的波函数。

麻省理工公开课 - 化学原理课程节选

"Today,the goal of modern apocalyptic terrorism is often to do as much disruption as possible and kill as many as possible in order to realy shake up the way in which societies operate and governments make decisions and make the pain so high that decisions are reassessed."

VOA: standard.2010.03.30