Fluocarbon
氟代烃
🗣️ 情景例句
I don't have time to be exhausted.
我没有时间去精疲力尽。
The many children of that family used to play together for hours.
那一家的孩子们常常大伙一起玩上几个小时。
I can't see. I think they're in her pencil-box.
我看不到。我想大概在她的铅笔盒里。