Rashing
煤层底板的软碳质页岩
🗣️ 情景例句
I'm leaving for Beijing on a four-day tour.
我马上要去北京旅游4天。
Today, I'd like to show you something which I'm sure you'll find interesting.
今天我要向你们展示一些东西，我相信你们会感兴趣的。
For a beginner, you're pretty good.
做为一个初学者，你已经做得很好了。