把铁炼成钢是铁的精炼过程。
Changing iron into steel is a process of purifying the iron.
本实验主要探讨了牡丹籽油的精炼过程及精炼过程中理化特性的变化。
Refining process of peony seed oil and changes of its physicochemical characteristics during the process were analyzed in this study.
基于该工艺过程的物理模拟研究，分析了有关参数对精炼过程的影响。
Based on some studies of physical modeling for the process, the effects of the related parameters on the process were analyzed.
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