you can do a thing called A Levels, which is two years in college.

你就可以得到A等级，你可以在大学读两年。

英国的高考 - SpeakingMax英语口语达人

But this is where for lack of a better term non-western countries really formally challenged at the highest levels and the lowest, too.

之所以这么说，是因为找不到更好的表达方式了,这表明非西方国家,从最高层面和最低层面都提出了挑战。

普林斯顿公开课 - 人性课程节选

And then you'd sit your A Levels as well when you are 18.

在18岁的时候，也会参加 A Levels的考试。

英国的教育 - SpeakingMax英语口语达人

What we're going to start with is discussing photoelectron spectroscopy, which is a spectroscopy technique that will give us some information about energy levels in multielectron atoms.

首先，我们将讨论,光电子能谱，通过这种技术,我们能够得到多电子原子的能级信息。

麻省理工公开课 - 化学原理课程节选

And this can be asked at all sorts of levels but a simple level is what makes for a pretty face?

这可以在很多层面上问及,但一个简单的层面就是什么才是好看

耶鲁公开课 - 心理学导论课程节选

Eating a high fat diet but one that's low in cholesterol can still potentially lead to high cholesterol levels.

食用高脂但低胆固醇的食物,仍可导致胆固醇含量偏高

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

That rate of rise is steeper so they--antibody levels go up more rapidly and they reach a higher level.

同时,上升速度也更加迅速,以达到更高的浓度水平

耶鲁公开课 - 生物医学工程探索课程节选

Not lower high expectations-- that won't make a difference to our levels of wellbeing.

而不是低的和高的期望-,那不会影响我们的幸福水平。

哈佛公开课 - 幸福课课程节选

because in elementary school and junior high, you have such a variety of skill levels and effort levels.

因为在小学和初中，大家的水平和努力程度不同。

怎么协调意见冲突 - SpeakingMax英语口语达人

Now what I want to do is take you exactly to this place where we are right now, where we see energy levels and electron filling, but I want to start all over again and I want to use a totally different approach.

现在我想做的是带你们,到达我们现在所处的地方，我们能看到能量级和电子分布的地方，但我想重新开始,而且用一个完全不同的方法。

麻省理工公开课 - 固态化学导论课程节选

the United States announced a target to reduce its emissions by 17% below 2005 levels in 2020.

美国宣布了到2020年实现在2005年的水平基础上减排17%的目标。

对全球变暖的政策 - SpeakingMax英语口语达人

At some point, maybe a week later, four to eight days later, you would start to see antibody levels rise.

之后,或许一周之后,四天到八天之间,就可以看到抗体的浓度开始上升

耶鲁公开课 - 生物医学工程探索课程节选

And even though he could figure out that this wasn't possible, he still used this as a starting point, and what he did know was that these energy levels that were within hydrogen atom were quantized.

这是不可能的了,但他还是以此为出发点，他知道，氢原子的这些能级,是量子化的,而且他也知道，我们上节课所看到现象。

麻省理工公开课 - 化学原理课程节选

So, what he did was kind of impose a quantum mechanical model, not a full one, just the idea that those energy levels were quantized on to the classical picture of an atom that has a discreet orbit.

还不是完整的,只是这些能级，是量子化的概念，作用到原子有分立轨道的经典原子模型上,当他做了一些计算后,他得到有个半径,他算出来。

麻省理工公开课 - 化学原理课程节选

Those levels would reach a plateau after some period of time, maybe after a couple of weeks and then they would begin to decline again.

在一段时间后,抗体浓度将达到峰值,峰值大约出现在几周之后,之后,抗体浓度将开始下降

耶鲁公开课 - 生物医学工程探索课程节选

And we can look at precisely why that is by looking at the equations for the energy levels for a hydrogen atom versus the multi-electron atom. So, for a hydrogen atom, and actually for any one electron atom at all, this is our energy or our binding energy.

而且我们可以精确地看看,为什么是这样的,通过看对于氢原子和,多电子原子能级的方程所以对于氢原子，事实上对于任何一个电子，这是我们的能量或者我们的结合能。

麻省理工公开课 - 化学原理课程节选