First, the chemicals deposited on the rub provide information on the individual identity of an animal; no two mammals produce the same scent.

首先，擦痕上的化学物质提供了动物的个体特征信息；没有两种哺乳动物会产生相同的气味。

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She found many families were being exposed to high, sometimes deadly, levels of chemicals and other toxic substances, but she was not allowed to make her information public.

她发现，许多家庭都暴露在高水平的、有时是致命的化学物质和其他有毒物质中，但她不被允许公开自己的信息。

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The company's ion chip is the equivalent of a camera that can "read" chemicals, transmitting information directly between the biological and digital worlds.

公司的离子芯片相当于一部可以“阅读”化学品，直接在生物与数字世界之间传输信息的相机。

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The study does not, however, prove that the signals from sweat that the participants' brains responded to are "pheromones, " chemicals found in animals that communicate information and influence responses in behavior and physiology.

CNN: Sweat may give off stress signals, study says

In the meantime, consumers can find at least some information about products containing these chemicals in reports from independent organizations.

FORBES: Report Finds Toxic Levels of Phthalates Lurking in Popular Back-to-School Items

Union Carbide, a chemicals firm, has a link to information on the deadly Bhopal gas leak in India on its home page, for example.

ECONOMIST: Corporate history