This week in our series, Harry Monroe and Kay Gallant tell about Grants second term in office.

VOA: special.2010.02.25

So here I've written for the hydrogen atom that deceptively simple form of the Schrodinger equation, where we don't actually write out the Hamiltonian operator, but you remember that's a series of second derivatives, so we have a differential equation that were actually dealing with.

这里我写出了,氢原子薛定谔方程的,最简单形式，这里我们实际上,没有写出哈密顿算符,但是请记住那你有，一系列的二次导数,所有我们实际上会处理一个微分方程。

麻省理工公开课 - 化学原理课程节选

And now, the second program in our series, "A Princess of Mars."

VOA: special.2010.07.17

The second movie in the series, "New Moon," was released in November.

VOA: special.2010.01.20

Series' star Alec Baldwin was named best comic actor for the second year running.

VOA: standard.2009.09.21

We go into games with no preconceived notions." In U.S.college football, the University of Florida Gators won the title for the second year in a row and the fourth since 1996 when they beat Oklahoma in the Bowl Championship Series game January 9.

VOA: standard.2009.12.24