Ramdohrite
辉锑银铅矿
🗣️ 情景例句
OK. Do you know when you'll come and visit?
好啊。你知道几时还会再来拜访我们吗？
Since the contract is about to expire, shall we discuss a new one?
这个合同将到期，我们来谈谈新合同的事宜吧。
What happened before printing was invented?
印刷术发明以前是怎么一回事？