Quadric
a. 二次的\\nn. 二次曲面
🗣️ 情景例句
What kind of guarantee do you offer?
这种车有售后服务保证吗？
What is wrong?
有什么不对吗？
On Sundays, hundreds of people come from the city to see our town and to walk through the woods.
每适星期天，有许许多人从城里来观赏我们的小镇，并在树林中散步。