Fluorated
氟酸盐\\n氟化
🗣️ 情景例句
Bye.
再见。
Will you take that library book back for me?
你能帮我把书还回图书馆吗？
I'm calling to see if you would like to have lunch tomorrow.
我打电话给你，是想知道明天一起吃顿中饭怎样？