Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
I'm only here two days,
我只有两天时间，
When love puts in,friendship is gone.
爱情进入，友情完结。
An Indian came into the waiting room, and walked quickly to the doctor's door.
一个印度人走进候诊室，快步朝医生的门口走去。