Fluorate
氟酸盐
🗣️ 情景例句
May I have a pillow and blanket, please?
能给我一个枕头和毛毯吗？
Who is the auther of this novel?
谁是这本小说的作者？
How do you do ? Are you having a nice time in Beijing?
你好！你在北京玩得愉快吗？