Karstenite
硬石膏
🗣️ 情景例句
I certainly am. May I help you?
我是，我能帮您什么忙吗？
Whatever is worth doing at all is worth doing well.
凡是值得做的事，就值得做好。
and by the time he is grown and able to take part in its activities,
等他长大了，能做各种事了