这样的一种物质是如何对人体产生影响的呢？

How can such a substance have an effect on the body?

youdao

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.

youdao

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.

youdao

We could just collect a bunch of data. For a material .What's the volume it occupies at some pressure and temperature?

对一种物质我们可以得到一系列测量数据,在给定的温度和气压下,它的体积是什么？

麻省理工公开课 - 热力学与动力学课程节选

Is the mind to be understood in terms of this immaterial object, the soul? So are there two kinds of things?

难道心灵必须得被理解为,一种非物质客体,也就是灵魂吗,这两种东西是一样的吗

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That can be supplied by an antagonist called Aldopa - which is not exactly the same as dopamine, it's slightly different.

这种物质能够由一种拮抗剂,叫做阿多巴转化而来,但它与多巴胺的结构并不完全相同,有一点差别

耶鲁公开课 - 生物医学工程探索课程节选