Dr.Lepora says she will probably return to MSF, because she says once she learned how to be effective in a crisis situation, she finds it very difficult not to act when another crisis comes up.

VOA: standard.2010.06.29

z So what we end up seeing is 34 that the z effective is equal to positive 1 . 3 4.

看到有效的,等于+1。

麻省理工公开课 - 化学原理课程节选

2 So what we end up saying is that the z effective or the effective charge that that first electron feels is now going to be plus 2.

第一个电子感觉到的有效的z或者有效电荷现在是,我们再一次将它带入我们的方程。

麻省理工公开课 - 化学原理课程节选