这个挺简单的：
保证质量：
该术语油田（行业）也被用作整个石油工业的简写,不过,把石油工业划分为三个部门更为确切：上游部门（油井中的原油生产以及把水从油中分离出来（分离水和油））,中游部门（原油管道和油轮运输）,以及下游部门（成品油的精炼和销售）
英语翻译The term oil field is also used as a shorthand to refer
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