动词
中文翻译：研磨
同义词：
['refine', 'refinement', 'refinement process']
例句：
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1. The scientist carefully refined the new drug formula.
科学家仔细地改进了新药的配方。
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2. The engineer was refining his design for the new project.
工程师正在为新的项目精练他的设计。
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3. Refining oil is a complex process that requires high precision and expertise.
提炼石油是一个复杂的过程，需要高度的精确度和专业知识。