n. impurity
misc. impure substance ; contaminated substance ; foreign body
... inhalation 吸入 impurity 不纯物质 interaction 相互酌 ...
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... contaminant 污染物 contaminated substance 不纯物质 contamination 污染 ...
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在碳化过程中，毛织物由稀硫酸处理、烘干，然后升温直至不纯物质全部碳化。
In the carbonizing process, the wool cloth is treated with dilute sulfuric acid, dried, and then heated until the impurities are converted to carbon.
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