Lehmannite
铬铅矿
🗣️ 情景例句
If I fail this exam I'll fail the course.
我要是考试没通过，这门课就没学分了。
Please send your report to me at the office by Monday.
请于周一以前将报告送到我的办公室。
We are thinking of expanding into the Chinese market.
我们想把生意扩大到中国市场。