How can such a substance have an effect on the body?
这样的一种物质是如何对人体产生影响的呢？
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.
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。
These microplastics included a substance commonly known as PET and widely used in the manufacture of clothing and food and liquid containers.
这些塑料微粒包括一种通常被称为PET的物质，广泛用于服装、食品和液体容器的制造。
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.
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。
There is no consensus among researchers regarding what qualifies a substance as a pheromone.
对于什么物质能被称为是信息素，研究人员并没有达成共识。
我们有一种工作物质。
You need that object to be a substance, to be something.
这个物体得是某种物质，某种实体。
Resveratrol is a substance found in grapes and other plants.
白藜芦醇是葡萄和其他植物中的一种成分。
If you have a substance abuse problem, remember that help is available.
如果你有滥用物品的问题，记住，帮助是有的。
The way of measuring how acidic or alkaline a substance is a scale called pH.
衡量一个物质的酸碱性的方法是pH值的大小。
One sign of addiction is using a substance even when it’s known to be harmful.
成瘾的一个迹象就是即使我们知道它有害，但还是会继续实用它。
too narrow blood vessels due to a substance our kidneys make called angiotensin.
血压升高的两大原因：血量太高、一种由肾脏产生的血管紧缩素引发的血管变窄
The challenge lies in finding a substance that conducts electricity well and heat badly.
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。
A substance that improved memory would immediately raise larger social concerns, as well.
而且，可以增加记忆的物质也会立刻引起社会的关注。
The first were derivatives of creatine, a substance that helps to supply energy to muscles.
第一种是肌酸(一种为肌肉提供能量的物质)的衍生物。
In the island of Trinidad the oil is in the form of asphalt, a substance used for making roads.
在特立尼达岛，石油以沥青—即用作铺路的物质—形式存在。
The definition of a "nutrient" is a substance that is required for our bodies to properly function.
维持身体正常功能所需的物质，这是“营养素”的定义。
Both substances also contained a substance that would mark any mosquito that came in contact with it.
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。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
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 of identifying a substance without resorting to fiddly chemical methods is to determine its density.
其中一种不用高精度的化学方法验证物质的办法就是确定它的密度。
For the nickel-metal hydride version of the battery, that material is a substance called nickel oxyhydroxide.
相对于镍氢的电池，这种物质的实体材质被称为镍氢氧化合物。
One of its chief components is a substance called curcumin, which may turn out to be a potent fat fighter.
它的主要成分之一是一种叫做姜黄素的物质，它对减肥很有效果。
This is because tomatoes contain a high concentration of a substance called lycopene, which is an antioxidant.
这是因为番茄中含有高浓度的番茄红素，是一种抗氧化剂。
One consequence of dividing a substance into nanoparticles is that the surface area of the material greatly expands.
将物质制为纳米粒子的结果之一是材料的表面积极大地扩展了。
He then analysed the activity of their genes, as measured by the production of a substance called messenger RNA.
然后他分析了他们基因的活性——靠测量信使RNA的多少。
Conversely, 60 percent of people with a substance abuse disorder also suffer from another form of mental illness.
反过来看，滥用药物的人群中，60%患有某种精神疾病。
Conversely, 60 percent of people with a substance abuse disorder also suffer from another form of mental illness.
反过来看，滥用药物的人群中，60%患有某种精神疾病。
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