Polyalkenamer
[化] 开环聚环烯烃
🗣️ 情景例句
Pardon me.
劳驾。
I wrote several letters on my mother's behalf.
我代表我母亲写了几封信。
How did the bees know exactly in which diection to fly?
蜜蜂是怎样确切地知道朝哪个方向飞呢？