Early versions were mainly designed with two levels.

VOA: special.2009.12.29

The formula tells us or absorbed based on the energy difference between the two levels that we're going between, that the electron is transitioning between.

这些公式告诉我们,或发出的光的，频率大小,是基于，电子转移的，两个能级，之间的能量差。

麻省理工公开课 - 化学原理课程节选

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

India,for example, has promised to cut emissions by at least twenty percent from two thousand five levels by two thousand twenty.

VOA: special.2009.12.26

So this means that we can go directly from the energy between two levels to the frequency of the photon that's emitted when you go between those levels.

这意味着我们可以直接,从两个能级的能量得到它们之间,跃迁发射出光子的频率。

麻省理工公开课 - 化学原理课程节选

The agreement sets targets to prevent the Earth's average temperature from rising more than two degrees Celsius above pre-industrial levels.

VOA: special.2009.12.26

What I am doing, listen to me, I'm talking at two levels here.

我在做的是，听我说，我在谈论两个层次。

麻省理工公开课 - 固态化学导论课程节选

All agreed that global temperatures should not rise by more than an average of two degrees Celsius above pre-industrial levels.

VOA: special.2009.07.11

I'm going to give you goals in two levels.

我会给你们两种水平的目标。

麻省理工公开课 - 计算机科学及编程导论课程节选

The team found levels of lead as high as thirty-two thousand parts per million in tests on some paint samples from Ecuador.

VOA: special.2009.08.31

This class will be taught on two levels.

本课程将分为两个部分。

哈佛公开课 - 幸福课课程节选

His team found that levels of stress were highest among adults between the ages of twenty-two and twenty-five.

VOA: special.2010.08.03

If you have two different ligands stimulating two different receptors, and one causes activation of this enzyme and generation of cyclic AMP, cyclic AMP levels will start to rise.

如果有两种不同的配体,刺激不同的受体,一种能够活化酶,并促进生成cAMP,cAMP的水平就会升高

耶鲁公开课 - 生物医学工程探索课程节选

Scientists say it formed when high sea levels flooded the middle of North America, splitting the continent in two for millions of years during the late Cretaceous period.

VOA: special.2010.10.05

And what we predict as an energy difference between two levels, we know should correspond to the energy of light that's either emitted, if we're giving off a photon, or that's absorbed if we're going to take on a photon and jump from a lower to a higher energy level.

我们预测，两个能级之间的能量差，我们知道，它要么和发出的光有关,如果它发出光子的话，要么它吸收光子,从低能级跃迁到，更高能级上去。

麻省理工公开课 - 化学原理课程节选

Two genes are responsible for Shh levels.

VOA: special.2009.12.22

What happens is these two levels displace.

两个能级发生了分裂。

麻省理工公开课 - 固态化学导论课程节选

Indian Kashmir has been wracked by a two-decade-long separatist insurgency, although levels of violence have sharply dropped in the lpast five years.

VOA: standard.2009.10.28

Here I just show tissues at two levels of magnification and when we think about tissues we're going to be interested in a couple of different characteristics.

这里我就给你们展示一下,从两个不同水平看到的组织,当我们研究这些组织时,我们将会对它一大堆不同的特点产生兴趣

耶鲁公开课 - 生物医学工程探索课程节选

Two levels.

就是这两个部分。

哈佛公开课 - 幸福课课程节选