Polyfluocarbon
[化] 多氟烃
🗣️ 情景例句
Don't cross that bridge till you come to it.
没到河边，先别操心怎么过桥。
We have a toll-free number for customers to call.
我们对顾客提供免费服务电话。
Everybody here is busy getting ready for it and buying Christmas presents.
这里的每一个人都在忙于为圣诞节做准备和忙于购买圣诞节礼物。