continuous zone refining

例句：

1. 1. Continuous zone refining is a process used to removeimpurities from crude oil.
   连续区域精炼是一种用于从原油中去除杂质的过程。
2. 2.The refinery uses continuous zone refining to produce high-quality gasoline.
   炼油厂使用连续区域精炼生产高质量的汽油。
3. 3. Continuous zone refining has been shown to improve the qualityof petroleum products.
   研究表明，连续区域精炼可以提高石油产品的质量。