Perfluocarbon
[化] 全氟化碳
🗣️ 情景例句
I don't envy him his money problems.
我庆幸自己没有他那些金钱的烦恼。
At each other's throats.
自相残杀。
What happened before printing was invented?
印刷术发明以前是怎么一回事？