Olefination
烯化作用, 成烯作用
🗣️ 情景例句
It's nice to be alone with you, Grandpa.
很高兴单独与你在一起， 爷爷。
The clerk helped me find what I wanted.
职员帮助我发现我想要的东西。
The factory has been there for several years.
这家工厂在那儿已有好几年了。