“烯”造句

烯空气跟空气十分近似.
Olefin gas closely approximates air.

所有的主要难点都涌现在烯酮 ( 1 ) 的合成中.
All the chief difficulties crop up in the synthesis of the enone ( 1 ).

某碳氢化合物已知可能是烯烃或是烷烃.
A hydrocarbon was known to be either an alkene or alkane.