certain chemicals

The problem with the ozone layer is that when certain chemicals, like chlorofluorocarbons, reach the stratosphere, they break down into chlorine and bromine, which react with the ozone and destroy it.

科学家们认为人类造成臭氧层破坏的主要原因是一些化学物质，像氯氟碳，当它们到达平流层后会分解成氯和溴，然后和臭氧发生化学反应从而破坏臭氧层。

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scientists study the carcinogen effect of certain chemicals.

科学家们研究某些化学物质的致癌作用。

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a lab technician mixes your red blood cells with certain chemicals.

实验室的实验师把你的红血球与某些物质混合。

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If you are in short of sleep, certain chemicals in your body will not work well and tell your brain in time that you have eaten enough.

如果你缺少睡眠，你体内的某些化学物质就不能很好地发挥作用，也无法及时告诉你的大脑你已经吃饱了。

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HDAC removes certain chemicals , called acetyl groups , from a wide range of proteins.

HDAC可以从很多蛋白质中去除一种叫做乙酰基的化学结构.

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FRANK BIRO: "In addition to the types and amount of food we eat, the other important factors are some of these chemicals. For example, personal care factors, such as cosmetics, such as suntan lotions, contain certain chemicals that could impact timing of or other body functions."

Frank Biro：“除了我们使用的食物的种类和数量之外，其他重要的因素就是这些化学物质。例如，个人护理因素，比如化妆品和洗涤剂中包含的化学物质可能影响成熟的时间和其他身体功能。”

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Certain chemicals can induce undesirable changes in the nervous system.

有些化学物质能在神经系统中引起不良变化.

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certain chemicals should not be mixed, as they may have a violent reaction.

某些化学药品不该混和在一起, 因为它们可能引起剧烈的反应.

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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.

报告称,发育中的大脑特别容易受这些产品中某些化学物质的毒性影响,它们造成的损害可能是永久性的。

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The fission of the cell could be inhibited with certain chemicals.

细胞的裂变可以通过某些化学药品加以抑制.

《简明英汉词典》

Certain chemicals are easily absorbed into the bloodstream, while others are not.

某些化学药品很容易溶于血液, 有些则不行.

《简明英汉词典》

Researchers at the University of California, Davis, noticed that certain chemicals, notably9 dimethyl sulphide,

加州大学戴维斯分校的研究人员注意到，某些化学物质，

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certain chemicals can mix with trapped oil and make it less viscous, so that it can flow toward the well.

某些化学药剂能和困在油层中的石油混合，降低其黏稠度，使石油流向油井。

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whenever certain chemicals are mixed together, heat is produced.

某些化学物质被混到一起时, 就会产生热.

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it appears likely that conscientious and unconscientious people have different levels of certain chemicals in their brains.

看来可能是有责任心和没有责任心的人相比，他们的大脑某些化学物质的水平不同。

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researchers have wondered whether being able to taste certain chemicals puts us at an evolutionary advantage.

研究人员想知道:品尝特定化学物质的能力是否令我们具有进化优势.

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however, it may be a practical way to make or isolate certain chemicals.

但是, 它可能是制造和分离某些化学物的特殊方法.

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An imbalance in certain chemicals leads to disturbances in the brain's function.

某些化学成分失衡会道致大脑功能的紊乱.

《简明英汉词典》

they say that certain chemicals are made and laid down in the living cells.

他们说已在活细胞内培养出某些化学成分,并已沉积下来.

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