Polycyclopentadiene
聚环戊二烯
🗣️ 情景例句
It's tough getting an O.K. from the boss.
很难从老板那听到声“同意”。
Hmm, I love the perfume.
哼，我很喜欢香水。
I'd like to know how you reached your conclusions.
我想知道你们是如何得出结论的。