Prodan
氟硅酸钠
🗣️ 情景例句
Your buildings are very large, aren't they?
你们的厂房很大，对吗？
Thank you for inviting me to speak at the dinner.
谢谢你邀请我共进晚餐。
Everybody admires him for his great sense of humour --
人人都钦佩他那绝妙的幽默感 -- 人人，