Each one works with 2,000 people. The field officers go from house-to-house, person-to person to get each individual to become active in the fight against HIV/AIDS.

VOA: standard.2010.07.01

When you go into the Coulombic term here, 3*2 instead of one times one, it's three times two.

当你想到库仑力时，和1*1相比，这是。

麻省理工公开课 - 固态化学导论课程节选

OK, that's not so bad. Moving a stack of size 2 if I want to go there, I need to put this one temporarily over here so I can move the bottom one before I move it over.

好，并不那么难，移动上面两个圆盘的话2,我需要把最小的盘子，临时先放到多余的柱子上来,这样才能在把它移过来之前,把最底下的盘子放到目标柱子上。

麻省理工公开课 - 计算机科学及编程导论课程节选

2 3 4 We go one, two, three, four.

我们开始了。

麻省理工公开课 - 固态化学导论课程节选

And if that is the energy to go from n equals one n=2 this is the amount of energy that has to be left as kinetic energy of the electron.

如果这个能量是从n=1到,然后，to，n，equals，two，then,这些能量,会作为电子的动能,被消耗掉。

麻省理工公开课 - 固态化学导论课程节选