But Jim Fenton, director of the Florida Solar Energy Center at the University of Central Florida, says costs are falling quickly.

VOA: standard.2009.10.27

In terms of picking a Lewis structure that's going to be the lowest energy, what you want to do is put the atom with the lowest ionization energy in the center of your atom.

为了挑选一个具有,最低能量的路易斯结构，你需要把电离能最低的原子,放在最当中的位置。

麻省理工公开课 - 化学原理课程节选

So, we keep the atoms with the lowest ionization energy in the center.

因此，我们把电离能,最低的原子放在中间。

麻省理工公开课 - 化学原理课程节选

The summit will take place at a convention center recognized for leadership in energy and environmental design.

VOA: special.2009.07.13

And, it says, OK, center the element with the lowest average valence electron energy.

它说，好的,把具有最低平均价电子能的元素画在中心。

麻省理工公开课 - 固态化学导论课程节选

For example, the United States and China will jointly establish a clean energy research center.

VOA: special.2009.11.21

Let's take a look at the lowest ionization energy in the center case.

让我们来看一下电离能最低在中间的情况。

麻省理工公开课 - 化学原理课程节选

Carbon should be in the center because it has the lowest ionization energy.

这是因为,碳的电离能最低。

麻省理工公开课 - 化学原理课程节选