Fluoram
二氟化铵
🗣️ 情景例句
what you need to fix up the old library.
你们修复旧图书馆所需要的东西。
None are so deaf as those who will not hear.
不愿倾听意见者最聋。
They put small presents in each other's stockings.
他们把小礼物装进对方的长统袜里。