Dienes
[化] 双烯; 二烯烃
🗣️ 情景例句
Our teacher drills us in English.
我们老师让我们反复操练英语。
I subscribed to a lot of periodicals last year.
去年我订了许多期刊。
When he died at the age of eighty,
他80岁那年死去时，