vapour-phase refining

例句：

1. 1. Vapour-phase refining is a process used in the production of petroleum products.
   汽相精制是一种用于生产石油产品的工艺。
2. 2.The company uses vapour-phase refining to improve the quality of its oil products.
   该公司使用汽相精制来提高其油品的质量。
3. 3.Vapour-phase refining is an effective way to reduce the amount of impurities in petroleum products.
   汽相精制是一种有效的方法，可以降低石油产品中的杂质含量。