Adelite
砷钙镁石
🗣️ 情景例句
Are you Mr. Chen?
你是陈先生吗？
I don't know the answer, but let me ask Mr. Chen to comment on that.
我不知道答案，让我问一下陈先生看他有什么看法。
Is there a river in the picture?
画里有一条河吗？