Picrofluite
氟镁石
🗣️ 情景例句
What am I supposed to do?
我该做什么？，
One thing, however, that we should not forget in doing business is to have a sense of appreciation.
可是有一件事我们做生意时不能忘，就是保持一份感恩的心情。
Who's that?
那个人是谁？