铸造技术不完善、铜合金原料中的杂质致使水龙头零件表面疏松，并有大量砂眼。
The defects of casting technology and the impurities in copper alloy material cause roughness of faucet surface with large amounts of sand holes.
与冶炼矿石一样，石油提炼是一个从未加工的原料中除去杂质的过程。
Refining, like smelting, is a process of removing impurities from a raw material.
分析了引起聚丙烯装置异常波动的原因，并确定是丙烯原料中杂质砷含量偏高所致。
Unusual trouble of the polypropylene equipment is analyzed to confirm that it is cased by the high impurity of arsenic in the raw material propylene.
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