Stereomutation
立体变硬, 体积改变
🗣️ 情景例句
Have you ever been to a buffet dinner?
你去吃过自助餐吗？
Pupil. He is studying.
学生。正在学习。
I've read about it,but I'd like to know more about it.
我已经知道了一点儿，但我还想多了解一些。