Hydrofluosilicate
[医] 氢氟硅酸盐
🗣️ 情景例句
I was very sad indeed to hear about it.
听了这件事，我的确非常难过。
Can I have a second-class one way ticket to Chicago,please?
请给我一张去芝加哥的单程二等票好吗？
About a month.
大概一个月。