Any of three gaseous isomeric ethylenehydrocarbons, C4H8, used principally in making synthetic rubbers.
丁烯乙烯的三种气态同分异构体之一，C4H8，主要用于制造合成橡胶。
2
Ethylene can also be turned into alkanes, a class of hydrocarbons that are a component of gasoline.
乙烯还可以转变成烷烃——是石油中含有的一种碳氢化合物。
3
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.