我想知道中国发射上一颗北斗卫星的时间。

I wonder when China sent the last Beidou Satellite.

youdao

他们把飞船发射上天。

They shot the spaceship up into the sky.

youdao

去年，1000多枚火箭被发射上天以确保奥运会开幕式当天夜空晴朗。

Last year, more than 1, 000 rockets were fired to ensure a dry night for last year's Olympic opening ceremony.

youdao

It makes sense that it's going to come out of the highest occupied atomic orbital, because that's going to be the lowest amount of energy that's required to actually eject an electron.

从最高占据轨道上,去掉一个电子是合理的，因为这样是发射一个电子,所损失的最低能量。

麻省理工公开课 - 化学原理课程节选

So, for example, it's not just the 2 p that we could actually take an electron from, we could also think about ejecting an electron from the 2 s orbital.

比如，我们不只可以从，2，p，轨道上,打出一个电子，还能考虑从，2，s，轨道上,发射出一个电子。

麻省理工公开课 - 化学原理课程节选

So let's do a sample calculation now using this Rydberg formula, and we'll switch back to emission, and the reason that we'll do that is because it would be nice to actually approve what we just saw here and calculate the frequency of one of our lines in the wavelength of one of the lines we saw.

让我们用Rydberg公式,做一个例题，我们回到发射上,这么做是因为这样,可以用我们看到的波长,来验证我们计算的频率。

麻省理工公开课 - 化学原理课程节选