o.le.fin
n.（名词）Any of a class of unsaturated open-chain hydrocarbons such as ethylene, having the general formula CnH 2 n; an alkene with only one carbon-carbon double bond. 烯烃：任何一类不饱和的开链碳氢化合物，如乙烯，总分子式为CnH 2 n；仅有一个碳—碳双链的链烯
来源：French (gaz) oléfiant [oil-forming (gas), ethylene] 法语 (gaz) oléfiant [油构成的（气体），乙烯] Latin oleum [oil] * see oil 拉丁语 oleum [油] *参见 oil-fiant [present participle of] -fier [-fy] -fiant [] -fier的现在分词 [使…化]
【引伸】
o.lefin.ic
adj.（形容词）
