fractionation effect

例句：

1. 1. The process of fractionation has been shown to be effective inpurifying oil.
   分馏过程已被证明在净化油方面是有效的。
2. 2. The fractionationeffect is a key factor in determining thequality of petroleum products.
   分馏效应是决定石油产品质量的关键因素。
3. 3. Thefractionation effect can be used to separatedifferent types of molecules in a mixture.
   分馏效应可以用来分离混合物中不同类型分子。