Polycyclopentadiene
聚环戊二烯
🗣️ 情景例句
I owe what I am to my uncle.
我能有今天要感谢我的伯父。
Be practical!
实际一点吧！
From one's own front door to home or foreign hills or sands and back again, everything is to hand.
从自己的家门出发到国内国外的山区或沙滩上露营然后返回，一切都很便利。