With the impasse unlikely to be resolved before the end of this month, when U.S.troops will drop to their lowest levels in Iraq since the war began in 2003, the U.N.Security Council pressed the legislators to work through their differences in "the national interest" and form "as quickly as possible, a government that is inclusive and represents the will of the Iraqi people."

VOA: standard.2010.08.04

So this is our final equation, and this is actually called the Balmer series, which was named after Balmer, and this tells us the frequency of any of the lights where we start with an electron in some higher energy level and we drop down to an n final that's equal to 2.

把2代入到这里，所以得到1除以,这就是我们最终的方程，这叫做Balmer系，以Balmer名字命名的,它告诉我们从高能级掉到n等于2的,最终能级所发出光的频率。

麻省理工公开课 - 化学原理课程节选