名词
中文翻译：原油净化
同义词：
['refining', 'clean-up', 'refinement']
例句：
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1. The crudeoil is being refined in the refinery.
原油正在炼油厂被精炼。
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2. Thecompany's goal is to improve thequality of its crude oil.
该公司的目标是提高其原油的质量。
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3. The process of crude oilpurification is complex and requires a lotof energy.
原油净化过程复杂，需要大量的能源。