Fluorid
n. 氟化物
🗣️ 情景例句
I have an idea that may solve the problem for him
我有个主意他也许能解决这个问题
You have to study English, don't you?
你必须学英语，不是吗？
Where are you going tomorrow? You said that you hoped it would be fine.
你明天打算去哪儿？你说你希望明天是个好天呢。