But the forts were so strong that the shells caused little damage.

VOA: special.2009.09.10

So, if we look at what the other sub shells are called, essentially we're just converting the number to a letter.

我们来看看,另外的子壳层叫什么，本质上，我们就是把数字转换为，一个字母。

麻省理工公开课 - 化学原理课程节选

So as we go down we're now adding electrons to further and further away shells, so what we're going to see is that the atomic radius is going to increase as we're going down the periodic table.

当我们向下走时,我们会将电子加在越来越远的壳层上，因此我们将看到原子半径,将随我们沿周期表向下走而增大。

麻省理工公开课 - 化学原理课程节选

The Spanish fired first. The shells missed.

VOA: special.2010.07.15

And, that's given by the balance between the attractive force of the ions offset by the repulsive force in the electronic shells.

而那是由,在离子的电子层之间的,引力和斥力相互抵消得到的。

麻省理工公开课 - 固态化学导论课程节选

There will also be a huge fireworks show with more than two thousand five hundred shells exploding over the National Mall.

VOA: special.2010.07.02

Soon the sun's warmth makes them shed crystal shells - Shattering and avalanching on the snow crust-- Such heaps of broken glass to sweep away You'd think the inner dome of heaven had fallen.

阳光的温暖接着使那水晶的硬壳,从树枝上崩落，一齐倾泻在雪地上-,这么一大堆碎玻璃尽够你打扫,你还以为是天顶的华盖塌了下来。

耶鲁公开课 - 现代诗歌课程节选

There,Darwin noted that levels of rock extending high above the sea contained the fossil remains of shells.

VOA: special.2009.02.25

If we look at this configuration, what we say is all of the electrons in these inner shells are what we call core electrons.

如果我们看到这个构型，我们所说的是,所有的内层,都是核电子。

麻省理工公开课 - 化学原理课程节选

They rushed to the harbor and cheered as the bursting shells lighted the dark sky.

VOA: special.2009.08.13

There is a huge difference between the energies in the outermost shell and the inner shells, which tells you that it's unlikely that any electrons except those in the outermost shell are going to be active.

最外层和最里层所具有的能量,有很大差异，而这告诉我们有一点是不太可能的,那就是除了最外层的电子,别的电子都是应该是活泼的。

麻省理工公开课 - 固态化学导论课程节选

More than four-thousand shells had been fired during the thirty-three hours of fighting.

VOA: special.2009.08.13

And remember, we're only talking about valence electrons, so the outer-most shells.

要记得，我们讨论的只是价电子，也就是最外层的电子。

麻省理工公开课 - 化学原理课程节选

On Wednesday,artillery shells hit the only remaining hospital in the area of fighting.

VOA: special.2009.05.16

Core electrons are all those electrons held in really tight with the nucleus in the inner shells, whereas the valence electrons are only those electrons that are in the outer-most shell, or at your highest value of n of the principal quantum number.

芯电子是那些,在内壳层被原子核束缚得非常紧的电子，而价电子只包括,最外层的电子，或者说主量子数，n，的值最大的那些电子。

麻省理工公开课 - 化学原理课程节选

And they could hear the sounds of shots and exploding shells.

VOA: special.2009.08.27

Soon the sun's warmth makes them shed crystal shells Shattering and avalanching on the snow-crust-- Such heaps of broken glass to sweep away You'd think the inner dome of heaven had fallen.

VOA: special.2010.09.17

She studied the sea shells she found.

VOA: special.2009.06.28

Shells set the trees on fire.

VOA: special.2009.11.26

Historian and naval officer Samuel Eliot Morison described the fighting this way in his book "The Struggle for Guadalcanal": "For us who were there, or whose friends were there, Guadalcanal is not a name but an emotion, recalling desperate fights in the air, furious night naval battles, frantic work at supply or construction, savage fighting in the sodden jungle, nights broken by screaming bombs and deafening explosions of naval shells."

VOA: special.2011.06.23