Wathlingite
镁硬石膏
🗣️ 情景例句
I was elected the student body president at my college.
我被选为校学生会主席。
To be of use in the world is the only way to be happy.
为善最乐。
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。