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？

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Caffeine, a substance found in coffee and some soft drinks, is also a drug.

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。

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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。

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Researchers at the University of Michigan say a substance developed from the spices could reduce the possibility of breast tumors.

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You need a substance and then that substance has to have a property that changes depending on the heat flow, i.e., depending on whether it's sensing that it's the same temperature or different temperature than something else.

你需要某种物质,它的某种性质,随着热量的流动而改变，也就是说,依赖于它是否感觉到它,与其他的物体处于相同的温度。

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It is a substance self which therefore endures through time, thus thoughts and actions at different moments of time may pertain to the same self.

因此不同时期的行为和思想,可能会从属于同一个，好，那么我们怎么编码实现这个呢？,听起来像个人工智能的问题。

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It is also a substance hitherto regarded as too toxic for people to tolerate.

ECONOMIST: Treating tumours

Hartline was apparently under the influence of a substance that caused him to hallucinate, Baer said.

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Nicotine, a substance common to all forms of tobacco, is a powerfully addictive drug.

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