What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们,不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

麻省理工公开课 - 化学原理课程节选

Because we know as we go to infinity, even though the density gets smaller and smaller and smaller, we still have electron density very far away from the nucleus.

因为我们知道即使到了无穷远处，尽管电子密度会变得非常非常非常小，但我们仍然有一定的电子密度，无论离原子核多远。

麻省理工公开课 - 化学原理课程节选

Think of how far away this is from Ezra Pound in St. Elizabeth's Hospital.

想想从圣伊丽莎白医院里的庞德,过渡到她的距离有多远。

耶鲁公开课 - 现代诗歌课程节选

However, there's this great question of how far do the Greeks pursue in a hoplite battle?

但是,这里又有一个问题,希腊人在方阵战中会从战场追出多远呢

耶鲁公开课 - 古希腊历史简介课程节选

How far am I from camp?"

我离营地有多远"

耶鲁公开课 - 基础物理课程节选

But the second factor is how far away we are from the nucleus.

但还有第二个因素,那就是我们离原子核有多远。

麻省理工公开课 - 化学原理课程节选

And when we talk about size, I'm again just going to say the stipulation we're not talking about an absolute classical concept here, but in general we're going to picture it being much further away from the nucleus as we move up in terms of n.

当我们说到尺寸时，我们只是说――,经典的绝对的概念，而是它大约,离原子核有多远。

麻省理工公开课 - 化学原理课程节选

So, I want to contrast that with another concept that seemed to be opposing ideas, and that is thinking about not how far away the most probable radius is, but thinking about how close an electron can get to the nucleus if it's actually in that orbital.

我要将它和另外一个,看起来相反的概念相比较，我们不是考虑,最可能半径离原子核有多远，而是考虑如果电子在那个轨道上,能多接近原子核。

麻省理工公开课 - 化学原理课程节选

Then the acceleration of the planet is the force of gravity between the planet and the Sun, which Newton will tell you is directed towards the Sun and it depends on how far you are.

行星的加速度源自,行星和太阳之间的作用力,牛顿认为这个力指向太阳,它的大小取决于行星离太阳有多远

耶鲁公开课 - 基础物理课程节选