Volborthite
钙钒铜矿
🗣️ 情景例句
Richard, isn't that too much to ask of your mother?
Richard，那是不是太麻烦你母亲啦？
Small gains bring great wealth.
小益聚大财，薄利成巨富。
First, I'd like to tell you a few things about this factory.
首先，我想告诉你们有关这家工厂的一些情况。