Also,the nation's overall unemployment rate was 10.2 percent in October, its highest level in 26 years.

VOA: standard.2009.11.12

At this point, we have no other choice but to double up before going to the next energy level, 2px so we'll put a second one in the 2 p x.

在这点上我们没有其他选择,而只有双倍填充,在到下一个能级之前，所以我们放入第二个电子至。

麻省理工公开课 - 化学原理课程节选

Last year, the SEC put out a proposal that -it's getting too easy to be an accredited investor -so they put out a proposal that we raise the wealth level to $2.5 million.

去年证交会发布了一项提议,鉴于合格投资者的门槛较低,因此他们提议,把准入门槛提高到250万美元

耶鲁公开课 - 金融市场课程节选

So anything that goes from a higher energy level to 2 is going to be falling within the Balmer series, which is in the visible range of the spectrum.

任何更高能级到2能级2,都是属于Balmer系，它在可见光谱中。

麻省理工公开课 - 化学原理课程节选

So, our next level up that we can go is going to be the n equals 2 energy level, but we also have an l and an m value, 0 so our lowest l is going to be a there.

所以下一个能量,是n等于2的能级，但我们还有l和m的值，所以我们最低的l等于。

麻省理工公开课 - 化学原理课程节选

So what we'll do is this problem here, which is let's calculate out what the wavelength of radiation n would be emitted from a hydrogen atom if we start at the n equals 3 level and we go down to the n equals 2 level.

我们来做这个问题,让我们来计算一下,从n等于3到,等于2能级氢原子辐射的波长是多少。

麻省理工公开课 - 化学原理课程节选