烯烃主要是来自石油气或大分子的碳氢化合物裂解，如乙烯，丙烯。
The olefins, such as ethylene and propylene, are formed from petroleum gas or from cracking of larger hydrocarbons. Ethylene is used to make polyethylene e.g.
丙烯共聚物，聚丙烯组合物及其用途，过渡金属化合物和烯烃聚合催化剂。
Propylene copolymer, polypropylene composition, use thereof, transition metal compounds, and catalysts for olefin polymerization.
从收集到的液体燃料中检测出8种主要物质，分别为高级烯烃、炔烃、杂环化合物和多环有机物。
And there are 8 kinds of main components in liquid fuel, which belong to higher olefine hydrocarbon, acetylene series, heterocyclic compound and polycyclic organic matter.
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