Polycyclopentadiene
聚环戊二烯
🗣️ 情景例句
Very few people last in this class for the full hour the very first time.
很少人能够第一次撑完一个小时的课。
I meet the boy whose aunt is a musician.
我遇到那个男孩的姑妈是音乐家。
I suppose it's better to be safe than sick.
我想安全总要比生病好。