This chemical is not to be exposed to air.

这种化学制品不可暴露于空气之中.

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The relic, when exposed to air, turned to dust.

这件文物, 接触空气之后, 变成了粉末.

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In reality, sebum turns the color of mud when exposed to air.

事实上, 皮脂在暴露在空气中时会转变成泥土的颜色.

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This liquid is not to be exposed to air, for it will soon evaporate.

这种夜体不可暴露在空气中, 因为它会很快蒸发掉.

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