But the starting point was so high that even now the problem remains widespread.

VOA: standard.2010.07.28

Absorption is just the opposite of emission, so instead of starting at a high energy level and dropping down, when we absorb light we start low and we absorb energy to bring ourselves up to an n final that's higher.

吸收就是发射的逆过程,与从一个高能量到低能量不同，当吸收光时，我们从低能量开始,吸收能量到一个更高的能量。

麻省理工公开课 - 化学原理课程节选

With his poll numbers slipping and unemployment still high, President Obama is traveling again, to tell the American people that his Recovery Act is starting to work.

VOA: standard.2009.08.05