multipass zone refining

例句：

1. 1.The refinery uses a multipass zone refining process to produce high-quality petroleum products.
   炼油厂使用多段区域精炼过程生产高质量的石油产品。
2. 2.The new technology is designed to improve the efficiency of multipass zone refining.
   这项新技术旨在提高多段区域精炼的效率。
3. 3.Multipass zone refining has been shown to significantly reduce the environmental impact of oil production.
   研究表明，多段区域精炼显著降低了石油生产的环境影响。