Danks
煤页岩, 黑色碳质页岩
🗣️ 情景例句
Well, here's a twenty.
嗯 ，这是二十美元。
All products have to pass strict inspection before they go out.
所有产品出厂前必须要经过严格检查。
Only one or two people have objected that the students will drive too fast!
只有一两个人提出反对意见，说学生们会把车开得太快！