Under the old shell is a new shell and four wings.

在旧壳下有一个新壳和四个翅膀。

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Egg shell: Egg shell has little nutritional value. It is just a build up of a calcium compound.

蛋壳：蛋壳含有很少的营养价值，是由钙的化合物构成。

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And, this outermost shell is termed the valence shell.

这个最外层被称作价电子层。

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The shell dropped and exploded above Fort Sumter, a United States military base on an island in the harbor.

VOA: special.2009.08.13

Because that will take care of all of the electrons that are capable of reacting, none of the inner shell electrons.

因为那样我们可以考虑到,除内层电子以外，所有可以发生反应的电子。

麻省理工公开课 - 固态化学导论课程节选

So, from going from the shell of n equals 2, let's say, to the shell of n equals 3.

比如说，从ｎ等于２到ｎ,等于３壳层如何变化。

麻省理工公开课 - 化学原理课程节选

The cruiser then sailed into the channel and started to fire shell after shell at us.

BBC: Watching the start of World War II

The Shell card once offered a straightforward 5% rebate on Shell gas purchases.

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"Shell is in this game to gain an advantage, " says Wim Walk, manager of new geophysical technologies at Shell.

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