“炼金术曾经是化学的同义词”纽曼教授说，“并且化学的概念比元素变化更庞大。”
“Alchemy was synonymous with chemistry,” said Dr. Newman, “and chemistry was much bigger than transmutation.”
这就是教学大纲，两大块，第一部分是化学的通则，关于这点，我们的课程1,还有，5。111课程以及，5。112课程都是一样的。
So, here's the syllabus: two big blocks, first block general principles of chemistry, 1 and that's the same whether you take 3.091 or 5.111 or 5.112.
这也就意味着我对他们作业的长篇大论更多的可能是满足我自己的意愿，想让他们在功课上像我一样成功，而不是对他们学习数学或者是化学的关心。
Which means that my homework haranguing may be more about my own need to make them as successful in school as I was than it is about their knowledge of math or chemistry.
该病是由大脑里一种化学失衡引发的。
The illness is triggered by a chemical imbalance in the brain.
化学是19世纪初期最杰出的实验室科学。
Chemistry was par excellence the laboratory science of the early nineteenth century.
冲击波是在易挥发的化学品爆炸时产生的。
她的专长是数学、地球科学和化学。
遗憾的是，我从未上过有机化学课，但我最近开始读一些相关的书。
Unfortunately, I've never taken a course in an organic chemistry course, but I've started reading some books about it lately.
我当然不明白它们是如何与化学反应联系起来的，更不用说我感兴趣的其他学科了。
I certainly didn't understand how they even connected really to chemical reactions, much less other disciplines that I was interested in.
但当我们用化学方法分析这些细胞时，我们发现了一些非常有趣的东西，其中有一种化学物质，是一种叫做端粒酶的酶。
But when we analyze these cells chemically, we find something very interesting, a chemical in them, an enzyme called telomerase.
这种化学腺苷是脑细胞活跃时释放的。
The chemical adenosine is released by brain cells when those cells are active.
光感受器是通过发出化学信号来对光作出反应的细胞。
Photoreceptors are cells that respond to light by sending out a chemical signal.
有机食品是纯粹的不含人工化学制剂或杀虫剂的食物。
Organic food is unadulterated food produced without artificial chemicals or pesticides.
报告说，正在发育的大脑特别容易受到这些产品里可能含有的某些化学物质的毒性影响，而这些化学物质造成的损害可能是永久性的。
The developing brain, the report says, is particularly vulnerable to the toxic effects of certain chemicals these products may contain, and the damage they cause can be permanent.
老师原来是约翰·奈特西格，就是他教罗琳化学的。
The teacher turned out to be John Nettleship, who taught Rowling chemistry.
他说，一种可能性是，眼泪会从身体中释放出某些化学物质，这些化学物质是在压力下积聚起来的。
One possibility he says is that tears discharge certain chemicals from your body, chemicals that build up during stress.
不幸的是，一些化学药品落在了一起，最后导致了爆炸，这是一个令人悲伤的事件。
Unfortunately, some chemicals there that fell together there and ended up causing a bit of an explosion, which was a sad event.
你看，原来某些微生物是化学合成的——它们不需要阳光，因为它们从化学反应中获取能量。
You see, it turns out that certain microorganisms are chemosynthetic—they don't need sunlight because they take their energy from chemical reactions.
我写的第一篇文章，是关于那位化学教授的简介，就是被评为年度教师的那个人。
The first article I wrote, it was a profile of the chemistry professor—the one who was named Teacher of the Year.
信息素和odorants （被检测为气味的化学物质）之间的区别可能是模糊的，一些研究人员将信息素归类为一种 odorant。
The distinction between pheromones and odorants—chemicals that are consciously detected as odors—can be blurry, and some researchers classify pheromones as a type of odorant.
这些细菌实际上就是硫化氢和二氧化碳的结合体，而这种化学反应产生的有机物质是更大的有机体的食物。
These bacteria actually combine the hydrogen sulfide with the carbon dioxide and this chemical reaction is what produces organic material which is the food for larger organisms.
这听起来很矛盾，因为这一假设背后的理念是，树叶在秋天产生的红色素是用于保护叶绿素这种吸收光的化学物质，以免它吸收过多的光。
It sounds paradoxical, because the idea behind this hypothesis is that the red pigment is made in autumn leaves to protect chlorophyll, the light-absorbing chemical, from too much light.
一个人的腋窝会产生全部的吸引力，一些块菌就是利用了这样一种人性的特性——至少在化学家看来是这样的。
A person's armpits have all the appeal, and some truffles take advantage of such a human nature—at least to chemists.
珀金刚入学的时候，皇家化学学院的院长是德国著名的化学家奥古斯特·威廉黑姆·霍夫曼。
At the time of Perkin's enrolment, the Royal College of Chemistry was headed by the noted German chemist August Wilhelm Hofmann.
植物通过空气输送的是一种名为挥发性有机化合物（简称VOCs）的化学混合物。
What the plants pump through the air is a mixture of chemicals known as volatile organic compounds, VOCs for short.
实验室的主管开始头疼和头晕，她说在那里吸入一些化学烟雾是很危险的。
The supervisor of the laboratory is beginning to get headaches and dizzy spells because she says it's dangerous to breathe some of the chemical smoke there.
饼干和脆饼干是用化学方法发酵的。
她发现，许多家庭都暴露在高水平的、有时是致命的化学物质和其他有毒物质中，但她不被允许公开自己的信息。
She found many families were being exposed to high, sometimes deadly, levels of chemicals and other toxic substances, but she was not allowed to make her information public.
实验室测试表明，这些千足虫体内的分泌物富含两种化学物质，这两种物质是有效的驱蚊剂，而蚊子携带的寄生虫会削弱卷尾猴的能力。
Laboratory tests show that secretions from the bodies of these millipedes are rich in two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate capuchins.
相反，刚从大学毕业的化学工程师的工资几乎是入门级高中毕业生的四倍。
Conversely, chemical engineers straight out of school can easily make almost four times the wages of an entry-level high-school graduate.
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