英语语法分析

This is known as vacuum fractionation.

这就是所谓的真空分馏。

Also, it is discussed about the role of organic acid on fractionation.

同时，探讨了弱有机酸的存在对轻重稀土分馏的影响。

Fermentation required only a day, and fractionation was not complicated.

发酵只需要一天，分馏并不复杂。