这样的一种物质是如何对人体产生影响的呢？
眼泪不仅能使你的眼睛保持湿润，它们还含有一种物质，可以杀死某些细菌，使它们不会感染你的眼睛。
Not only do tears keep your eyes lubricated, but they also contain a substance that kills certain bacteria so they can't infect your eyes.
一旦人类被看作是在进化过程中发展起来的，那么“人类是包含在他的本质中的一种物质”的观点似乎就站不住脚了。
Once man came to be seen as developing in the process of evolution, the idea of a substance which is contained in his essence seemed untenable.
在化学变化中，一种物质变成另一种完全不同的物质。
During a chemical change, one kind of matter changes into another completely different kind of matter.
我们可以根据物质的特性把一种物质与另一种物质辨别开来。
We can distinguish one kind of substance from another by its properties.
咖啡因，咖啡和一些不含酒精的饮料中的一种物质，也是一种毒品。
Caffeine, a substance found in coffee and some soft drinks, is also a drug.
他试图通过蒸馏法获得另一种物质。
一个就肯定是一种物质的物体。
从黄腿蛙的皮肤分泌物中提取出来的一种物质有望杀灭超级细菌。
One substance isolated from the skin secretions of the Foothill Yellow-legged Frog shows promise for killing superbug.
半透膜允许一种物质通过，但是不允许另外一种物质通过。
It allows one of the constituents but not others to pass through.
这两种喷雾中都含有一种物质，可以标记出接触过这种喷雾的任何蚊子。
Both substances also contained a substance that would mark any mosquito that came in contact with it.
而肯兹尤斯的设想只是向癌细胞内注入一种物质，起到微型天线的作用。
Kanzius's idea would require only an injection of substances that would accumulate in tumors and act like tiny antennas.
要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
记住上一次，或几次之前，我们说过最后一种物质是容易的一个。
Remember last time, or a few times ago, we said the last species is the easy one.
他目前面临的困难是，要找到一种物质，同时是很好的电导体又是热的不良导体。
The challenge lies in finding a substance that conducts electricity well and heat badly.
这一成分和酒精饮料中的是同一种物质，不过前者可是由玉米深加工产生的。
This is the same stuff as in alcoholic drinks, except that it's made from corn that has been heavily processed.
强迫大脑对同一种物质做出多种联系，实际上，会提供那个信息更多神经支架。
Forcing the brain to make multiple associations with the same material may, in effect, give that information more neural scaffolding.
事实上，因为在核爆炸时，许多物质的反应难以预测，所以要检测核弹中的每一种物质。
In fact, everything inside the bomb must be tested because materials tend to act in unpredictable ways during a detonation.
部分宇宙学家将这一发现理论化，认为宇宙中有一种物质我们无法观测到，这就是暗物质。
Some cosmologists theorize that this means there is a kind of matter we can't see at all, called dark matter.
对于每一种物质粒子，都被认为是存在着与它具有相同质量与但电荷相反的反物质的匹配物。
For every matter particle there is thought to exist an antimatter partner with the same mass but opposite charge.
有些大流行性流感疫苗含有佐剂以便减少病毒抗原的使用量(抗原是能够刺激免疫反应的一种物质)。
Some pandemic vaccines contain an adjuvant to reduce the amount of virus antigen to be used (an antigen is a substance capable of stimulating an immune response).
尤其是被称为丙二醛的这类和动脉硬化、癌症、糖尿病等一系列严重的疾病纠缠不清的一种物质。
One in particular, called malondialdehyde, is implicated in arteriosclerosis, cancer, diabetes and a host of other serious diseases.
例如，为什么只有一些特定种类的石鳖才有眼睛，还有它们是如何用同一种物质构建眼睛和甲壳的。
For instance, it's still not known why only some chiton species have eyes, or how the creatures are able to use the same material to make both their eyes and their shells.
他写道：“我开始把信息当做一种物质，并开始观察它是怎样通过人们和社会流动，怎样能使新信息带来改变。”
"I began to think of information as matter, and started to examine how it flows through people and through society, and how the availability of new information brings about change," he writes.
描绘沙漠的全景时运用广角镜头是最合适的，而对沙丘一侧顽强生存的植物的特写则表现出另一种物质。
A wide shot might best portray one desert, while a close-up of one plant struggling to survive on the side of a dune might best represent another.
如果我看看拉乌尔定律，很直接地就知道，液体和气体中，每一种物质的化学势，当然，它们必须相等。
Now if we look at Raoult's law, it's straightforward to say what is the chemical potential for each of the substances in the liquid and the gas phase. Of course, it has to be equal.
维他命d这种“阳光维他命”是我们晒太阳时，在皮肤中合成的一种物质，但防晒霜会阻碍这一过程的发生。
The "sunshine vitamin" is synthesized in our skin when we are exposed to direct sunlight, but sunblock impedes this process.
巧克力还有一种物质叫花生四烯酸乙醇胺(anandamide)(从梵语词ananda来，意思是平和幸福)。
Another substance found in chocolate is anandamide (from the Sanskrit word "ananda," which means peaceful bliss).
巧克力还有一种物质叫花生四烯酸乙醇胺(anandamide)(从梵语词ananda来，意思是平和幸福)。
Another substance found in chocolate is anandamide (from the Sanskrit word "ananda," which means peaceful bliss).
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