英语语法分析

The problems in production of low unsaturation polyether with DMC catalyst were introduced.

介绍了使用DMC催化剂生产低不饱和度聚醚时存在的问题。

The concept and calculation of degrees of unsaturation in organic chemistry are discussed in detail in this paper.

阐述了有机化学中不饱和度的概念，并对其计算作了详尽的介绍。

This paper gives the method of judging the hybridization form of central atomic orbital by unsaturation, applications and its laws.

提出了由分子的“不饱和度”判断中心原子轨道杂化方式的方法、应用及规律。