Improper quadric
[计] 异常二次曲面
🧩 词语组成解析
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
This is fun. It's a piece of cake.
有意思 毫不费力。
On a crowded train, one comes in contact with many people.
在拥挤的火车里面，会和许多人接触。
What did your boss say to him?
你老板是怎么对他说的？