英语语法分析

This paper reviewed the research progress in synthesis of citral in the recent years.

文章综述了近年来柠檬醛的合成研究进展。

Phase transfer catalyst was used for synthesis of citral diethyl acetal, the yield has increased.

用相转移催化合成了柠檬醛二乙缩醛，提高了产率。

The refining process of citral product from natural litsea cubeba was studied by means of vacuum batch distillation.

采用减压间歇精馏方法，对从天然产物山苍子油中提取柠檬醛产品的精制过程进行了研究。