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An airplane had flown over the area where the birds were kept and spread a powerful chemical called DDT.
VOA: special.2010.03.14
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So, now with this framework, I said that talking about these valence electrons might give us some insight into chemical reactivity.
所以，现在对于这个结构，我认为讨论价电子能,会让我们对化学反应有更深的领悟。
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I figured Chemical Engineering would be the best way to get into it because it's a really broad major.
我发现化学工程应该是接触新能源的最好方式，因为这个专业覆盖面也很广。
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When it reaches the brain, levodopa is changed into dopamine, the chemical that is lacking in people with the disease.
VOA: special.2009.04.07
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I certainly didn't understand how they even connected really to chemical reactions, much less other disciplines that I was interested in.
它们这么重要,我并不理解这些分子是什么，我也不知道它们。
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And it can limit the need for chemical fertilizers by letting animal waste do the job of natural fertilizer.
VOA: special.2010.01.19
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Why? Bundle of properties: mechanical strength, chemical inertness, ease of fabrication: that's not a unique solution.
为什么，属性的总和：,机械强度，化学惰性，易于制造，那不是独特的解决方法。
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The students use the mixture to fertilize the soil instead of buying chemical fertilizers that could harm the environment.
VOA: special.2009.04.14
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To ask questions like how much heat is released in a chemical reaction that takes place at constant temperature.
当我们想要知道,当一个化学反应在恒定的温度下发生时,会放出多少热量时。
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Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.
VOA: special.2010.01.26
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If you could introduce that gene you'd make the chemical, in this case it's a protein called vascular endothelial growth factor.
通过导入一种生成特殊化学物质的基因,这种疗法中指的是一种蛋白,叫做血管内皮生长因子
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This medicine seems to work by governing the activity of a chemical involved in information processing, storage and memory.
VOA: special.2011.02.08
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This is visualizing the process of the conversion of mechanical energy into chemical and electrical energy very nicely.
这一模拟恰到好处地演示了,机械能到化学能和电能的转换过程。
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Last July,the Food and Drug Administration advised manufacturers to add what are called physical chemical identifiers to their medicines.
VOA: special.2010.03.01
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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。
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But improved farming methods later increased their yields and, at the same time, made better use of chemical nitrogen fertilizer.
VOA: special.2009.07.28
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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。
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They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.
VOA: special.2009.01.20
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So recently we also set up a meeting with the new director of undergraduate studies in chemical engineering and
最近我们还和化学工程本科部的新主任开了一次会，
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Harvard's Nicholas Lange says the team looked instead at the chemical and electrical pathways that link the different parts of the brain.
VOA: special.2010.12.21
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These are things that must be taken in from the environment because your body cannot manufacture them and they promote specific chemical reactions in the body.
这些都是必须从外界摄取的物质,因为无法通过自身合成,它们能促进体内特定的化学反应
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Chemical sprays like air fresheners, hair spray,cleaning products and even strong beauty aids can trigger an asthma attack.
VOA: special.2010.09.07
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If you were to make that change you would find that the molecule now has completely different biological and chemical properties.
如果要做出这样的变化,你会发现,分子的生物形状,和化学性质完全改变了。
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Scientists at the agroforestry center say the use of fertilizer trees can reduce the need for chemical nitrogen by up to three-fourths.
VOA: special.2009.09.01
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Remember, all you have to do is fill in the one or two-letter abbreviation for the chemical symbol.
记住，你们只要,用一两个字母的缩写,来代表化学元素就可以了。
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She also shows how the chemical Luminol can reveal hidden blood stains that the eye alone cannot see.
VOA: special.2010.05.05
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This completely could change if you were to flip from one to the other conformation which can happen in chemical reactions.
在化学反应中,它们的形状,可以从一种折叠成另外一种。
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It asked more than one thousand women and minority members of the American Chemical Society about their experiences.
VOA: special.2010.04.01
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we'll start in on discussing chemical equilibrium, does deriving where they lie phase equilibrium?
我们就要开始讨论化学平衡，推导相平衡在什么位置？
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We can go back to ancient Egypt where there khemeia is reference in the hieroglyphs to term khemeia, which, among other things, meant chemical processes for embalming the dead.
我们可以追溯到古埃及,那的象形文字提到了词语,这是，在其他事情当中，意味着,化学过程处理防腐尸体。
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