1. refined sugar; refined oil; to gild refined gold- Shakespeare. 
   精糖；经过提纯的油；为纯金镀金-莎士比亚。
2. Oil must be refined before it can be used. 
   油一定要精炼后方可使用。
3. (3) "Oils" means any kind of oil and its refined products. 
   (三)"油类"是指任何类型的油及其炼制品。
4. (4) "Oil" means any kind of oils or its refined products. 
   　　(四)“油类”是指任何类型的油及其炼制品。
5. How crude oil is refined by distilling is studied in chemical engineering. 
   在化学工程中要研究原油通过蒸馏提炼的方法。

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• 1. 精制油
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• 2. 精炼油
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