Zedeflon
四氟乙烯均聚物
🗣️ 情景例句
Hey, what did you do on your trip?
嗨，旅游时玩的怎么样？
We couldn't help the accident.
我们未能防止事故发生。
I'm sorry, I don't know. You'd better ask that policeman.
对不起，我不知道。你最好问问那位警察。