Can n't you hear the alarm clock?

你没有听见闹钟响吗？

youdao

Can n't we stop dating underground?

我们能不再偷偷地约会了吗？

youdao

Can n't you see the significance in that?

你领会到其中的含义了吗？

youdao

But he says the United States can't solve the world's problems alone and it is time for all U.N.

VOA: standard.2009.09.23

So, it would be a good question to ask n why are we limited clearly there's this relationship between l and n, and we can't get any higher than n equals one.

那我们要问了,为什么我们被限制了，很明显，l和,有关系，为什么不能取到，n-1更大的值。

麻省理工公开课 - 化学原理课程节选

And, in fact, it can't even reach n, because then we would have no potential energy at all in our electron, which is not correct.

事实上，它连n都达不到，因为如果那样的话,电子就没有势能了，这是不可能的。

麻省理工公开课 - 化学原理课程节选

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