| 1. | It is free from air, moisture or impurities .
它不含空气，水份和杂物。
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| 2. | Impurities tend to segregate at grain boundaries .
杂质常常在晶粒间界偏析。
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| 3. | This impurity must be purged away after death .
这种污秽应该在死后加以净化。
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| 4. | The buildup of impurities often results in defective plating .
杂质的积累经常导致不良的电镀。
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| 5. | The impurities present have an important effect on the rate of setting .
存在的杂质对凝固速率有很大的影响。
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| 6. | Semiconductors containing such impurities are called p-type semiconductors .
含有这类杂质的半导体叫做P型半导体。
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| 7. | The residual impurities can effect wet-process production in several ways .
这些残留的杂质可能在几个方面影响湿法生产。
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| 8. | Silica, in fact, is a desirable impurity because it is one of the reactants .
硅石实际上是一种有用的杂质，因为它是一种反应剂。
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| 9. | Calcitic limestone is mainly caco 3 with relatively small amounts of impurities .
方解石灰岩，主要是由CaCo3和少量的杂质所形成。
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| 10. | An aqueous caustic solution removes carrier gas impurities harmful to the detector cell .
苛性碱溶液去除运载气体中对检测元件有害的杂质。
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