The inside is treated with urea, a chemical commonly used as fertilizer.

VOA: special.2010.03.15

These are actually all examples that we'll talk about in freshman chemistry at some point, as an example of a connection between a chemical principle we learn, and what we can know about how it functions.

作为联系一个我们,所学的化学原理,和我们能知道它，如何工作的例子。

麻省理工公开课 - 化学原理课程节选

Why did you choose Chemical Engineering as your major?

你为什么选择化学工程这个专业呢？

学习化学专业的原因 - SpeakingMax英语口语达人

Flavor aside, scientists have recognized it as a complex blend of chemical compounds with potential health effects, both good and bad.

VOA: standard.2010.06.30

Some chemical concepts that are important for us to all understand as we move forward and review of proteins and biochemistry, basically.

随着课程的深入,其中的一些概念,对我们全面理解课程内容至关重要

耶鲁公开课 - 生物医学工程探索课程节选

(OMITTED) Remais,an assistant professor at Emory University's Rollins School of Public Health in Atlanta, He says the growing economy is fueling environmental risks such as air pollution and chemical toxins, while age-old environmental challenges remain.

VOA: standard.2010.04.07

But you actually need to keep a few caveats in mind as you do this, which is the fact that trends predict a lot of chemical properties, but they can't predict everything in terms of biological properties.

不过在你使用的过程中,需要牢记一些注意事项,那就是元素周期律可以预言很多化学性质，但是不能预言一切性质,比如生物学性质。

麻省理工公开课 - 化学原理课程节选

And I also request the United Nations to give guarantees for our own personal integrity, as well as the lives of the people who are being attacked with chemical gases, with electronic interference at this diplomatic site of the sister Republic of Brazil."

VOA: standard.2009.09.29

Chemical properties: so let's put something up as a hypothesis.

化学性质：,我们先提出一些假设。

麻省理工公开课 - 固态化学导论课程节选

Generally, there are a couple of elements that one might set down as in a Petri dish, and wait to see if some chemical reaction might take place, but not at all sure of what it might be.

一般来说，都有几个元素,作者会把它们像放入培养基中一样培养,等待某种化学反应的产生，但对可能的结果却一无所知。

普林斯顿公开课 - 人性课程节选

So the point is, this balance between energy thatyou could think of as say bond energies in chemical reactions, and entropy that you can think of in terms of disorder, how many different possible combinations or configurations of something wrong, will dictate where the equilibrium lies.

关键在于，这种能量与熵之间的平衡,确定了平衡的条件，在化学中能量涉及键能，而熵和无序有关,即有多少可能的不同组合或者形位，二者的平衡会告诉我们平衡态是什么样子。

麻省理工公开课 - 热力学与动力学课程节选

I was at Princeton from 83 to 86, got my master in chemical engineering Now i serve as the administrator of the United States Envrionment Protection Agency My engineering background is extremely important to the job i do everyday.

3-86年我在普林斯顿大学学习，取得了化学工程的硕士学位,我现在的职务是,美国环境保护署署长,我的工程学背景,对我现在的日常工作十分重要。

普林斯顿公开课 - 领导能力简介课程节选

You have a diversity in the chemical changes that occur as a result of any of those connections.

又有多样化的化学变化,这是那些物理连接的产物

耶鲁公开课 - 生物医学工程探索课程节选

So I said before when we were talking about single atoms, we always define the zero energy as when an electron was actually ejected, but now, when we talk about chemical reactions taking place, it's very, very rare that we're actually going to be talking about anything that gets to this point here.

我之前说过，当我们讨论单个原子的时候，我们总是把零点能,定在电子被发射出去以后，但是现在，当我们讨论化学反应发生的时候，非常非常罕见出现，确实达到,这种程度的情况。

麻省理工公开课 - 化学原理课程节选

So what actually turns out the reality is that h e 2 does exist, but it exists as the weakest chemical bond known, and it wasn't, in fact, even found to exist until 1993, so I can assure you this is not a bond that you see very often in nature, and it is a very, very weak bond.

实际上He2键是存在的，但它是目前所知的最弱的键，直到1993年它才被发现，所以我可以向你们保证在,自然界你们不可能经常看到它，它是种非常非常弱得键。

麻省理工公开课 - 化学原理课程节选