Melanothallite
羟氯铜矿
🗣️ 情景例句
This is Susan with Jiaotong University student. May I have your name, sir?
我是交通大学的在校生苏珊，请问您贵姓？
I met one of the engineers over at the television station.
我在电视公司遇到一位工程师。
We are so familiar with the fact that man ages,
我们对人总是要衰老的现象并不陌生，