Clausthalite
[化] 硒鉛礦
??? 情景例句
Take it easy, sir. I'll need your name, in full, and what's happened.
別著急，給我你的全名和事情的情況。
No, thank you. But it was very kind of you to offer.
不用了，謝謝。承蒙您好意提出。
What's it used for?
有什么用途？