A drug is a chemical substance.

毒品是一种化学物质。

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Every chemical substance is a key to the gates of heaven and hell.

每一种化学物质都是一把打开天堂和地狱之门的钥匙。

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A molecule is the smallest part of a chemical substance.

分子是化学物质的最小的部分。

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Now that's pretty far fetched and not many people would say that a pop tart should be a controlled substance and regulated by government, but there are some very interesting chemical properties associated with foods like this that trigger things going on in the brain that affect us in a very big way.

这多少有点牵强,而且也没有很多人会认为,这种果酱馅饼应归为管制品,并受到政府监管,但有趣的是这种食品,确实有一些特别的化学特性,它会作用于大脑并会对我们产生大的影响

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

All supplies of the chemical substance at the hospital has been seized and will be examined.

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No chemical substance had been found in the flat so far, Mr Todd said - but officers were still searching the entire three-storey Victorian block early on Wednesday afternoon.

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Apparently the microwavable pad housed a chemical substance (manufactured by ADEKA) not quite stable enough to handle the heat, sparking a lengthy list of of cases where the liquid erupted from its container and provided an uncomfortable surprise to the poor soul embracing the creature's volcanic warmth.

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