Fluocarbon
氟代烃
🗣️ 情景例句
Hi, John, how's it going?
嗨，约翰，你好吗？
Thank you for your nice present.
谢谢你那么好的礼物。
Oh, dear! said Miss Yang. Are you sure you've lost it?
“哎呀！”杨小姐说，“你肯定你弄丢了？”