Paranthracite
高变质无烟煤
🗣️ 情景例句
You mean you never do anything yourself?
你意思是你自己不做任何事？
I'm going to show him how to speak English.
我正要指点他如何讲英语。
What happened before printing was invented?
印刷术发明以前是怎么一回事？