Lehmannite
铬铅矿
🗣️ 情景例句
Do I have to get it done by noon?
我必须在中午以前做完吗？
First, language is very important.
首先，语言是非常重要的。
I'm tired. I'm going home now. Goodnight!
我累了。我要睡觉了。晚安！