Phosphogypsum
磷石膏
🗣️ 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。
When can you pick up your ticket?
你什么时候可拿到车票呢？
But you still haven't explained what you're doing here.
啊，你还没有说你是来干什么的。