Diolefins
二烯属; 二烯属烃
🗣️ 情景例句
I would like to buy some stamps, please.
我想买些邮票。
Don't miss the boat.
不要坐失良机。
There is a car race near our town every year.
在我们镇子附近每年都有一场汽车比赛。