动词短语
中文翻译：Unknown
同义词：
['melt', 'refine', 'purify']
例句：
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1. The crucible was heated to a high temperature before the metal could be melted.
在金属可以被熔化之前，坩埚被加热到高温。
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2. The refiner used a special machine to purify the crude oil.
精炼者使用特殊的机器来净化原油。
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3. The process of refining involves removing impurities from the raw material.
精炼过程涉及从原料中去除杂质。