Olefinicpolymerization
[化] 烯烃聚合
🗣️ 情景例句
he could be so valuable.
他或许能够有所用。
No. Can't you see that rocket is almost falling down.
不。你不知道火箭快要倒下来了吗？
The things on show were all used a hundred years ago.
展出的都是100年前使用的东西。