Diolefins
二烯属; 二烯属烃
🗣️ 情景例句
We hope you're successful in your new post.
我们希望你在新的岗位上成功。
You (or One) cannot make a silk purse out of a sow's ear.
粗瓷碗雕不出细花来。
Hi, Lin Tao! What are you going to do on Sunday?
嗨，林涛！星期天你打算干啥？