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A drug is a chemical substance.
毒品是一种化学物质。
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The purification of a substance by exposure to the mechanical or chemical action of air.
物质暴露于空气中,通过机械作用或化学反应使其纯化。
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Is the substance a simple one, or a chemical compound?
物质是单质还是化合物?
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Is the substance a simple one, or a chemical compound?
物质是单质还是化合物?
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