Lithotope
岩石沉积环境
🗣️ 情景例句
After studying an hour, I finally got the hang of the lesson.
我学习了一个小时，终于理解了这一课的要点。
Are you through?
你有完没完啊？
Have you seen this article in the paper?
你在报上看到过这篇文章吗？