GbEng
工人们正去除银中的杂质。 Workers are removing impurities from silver.
食物中有一些杂质。 There are some impurities in food.
吸气剂以少量加入化学或冶金过程中用来吸收杂质的物质 A material added in small amounts during a chemical or metallurgical process to absorb impurities.
洗矿槽,淘汰盘一个倾斜的槽,在其中被碾压的矿石被流水冲刷以冲走杂质 An inclined trough in which crushed ore is washed with running water to flush away impurities.