Felsic
长英矿物
🗣️ 情景例句
If you don't know a person's last name, use 'ma'am' or 'sir'.
如果你不知道一人的姓， 你应称呼他为 'ma'am' 或 'sir' 。
That's quite all right.
没关系。
It's the most expensive model in the shop.
这是店里最贵的型号。