An exact shell clack sheet's geometric size calculation is the most important link n he design of manufacturing a spherical vessel.

精确的球壳瓣片的下料尺寸计算，是设计制造球罐的重要一环。

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And we can generalize to figure out, based on any principle quantum number n, how many orbitals we have of the same energy, n and what we can say is that for any shell n, there are n squared degenerate orbitals.

我们可以总结出来，在，主量子数为n的情况下，同一个能量上，有多少个轨道，我们可以说，对任何壳层，有n平方个简并轨道。

麻省理工公开课 - 化学原理课程节选

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

And so when we get to n equals three that would be m shell by the spectroscopists' notation.

当n等于3的时候,根据光谱学家的标记法，那就是第m层。

麻省理工公开课 - 固态化学导论课程节选

Also on Tuesday, an artillery shell struck inside a second U.N. school in the same town, but the boys' prep school was empty at the time, UNRWA director John Ging said.

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The Rainbow Hotel, where U.N. personnel once lived, was a burned out shell.

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