Fluorocarbon
[建] 碳氟化合物
🗣️ 情景例句
Forget it.
不足挂齿。
How much ham did you want to buy?
你要买多少火腿？
I was only five when my father had taken me abroad, and that we eighteen years ago.
我5岁那年，父亲就带我出了国，那是18年前的事了。