英语语法分析

Polymers of propylene or of other olefins, in primary forms.

初级形状的丙烯或其他烯烃聚合物。

The two main classes of petrochemicals are olefins and aromatics.

石化的两类主要产品是烯烃和芳烃。

Polymers of vinyl chloride or of other halogenated olefins, in primary forms.

初级形状的氯乙烯或其他卤化烯烃聚合物。