Hemicone
半锥体
🗣️ 情景例句
Only a five percent discount? How about twenty percent?
只打九五折？八折怎么样？
Eat your heart out!
羡慕吧！
The eraser goes from one student to another first one way, then another.
橡皮擦从一个学生传给另一个学生－先从这个方向传过去，然后返回来。