名词
中文翻译：Unknown
同义词：
['refinement', 'purification', 'dilution', 'depletion']
例句：
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1. The refinery processes crude oil to produce refined petroleum products.
炼油厂将原油加工成精炼的石油产品。
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2.The scientist conducted a purification experiment to test the effectiveness of the new filter.
科学家进行了一个净化实验，以测试新过滤器的有效性。
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3. Due to depletion of natural resources, we need to find alternative sources of energy.
由于自然资源的枯竭，我们需要寻找替代能源来源。