Fluoridizer
氟化剂, 氟化器
🗣️ 情景例句
His personality left a deep impression on us.
他的人品给我留下了深刻的印象。
You're going out of your way for us, I believe.
我相信这是对我们的特殊照顾了。
What's the deadline?
截止到什么时候？