An extremely adverse environmental condition, such as air pollution.

一种极端不利的环境条件，如空气污染。

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Single exposure to an environmental condition (not lasting more than a day).

单次(持续不超过一天)暴露在环境中。

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Single exposure to an environmental condition (not lasting more than a day).

单次(持续不超过一天)暴露在环境中。

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