Conics
n. 锥线法, 锥线论
🗣️ 情景例句
Yup.
是的。
What's done can't be undone.
无可挽回。 泼水难收？
The first thing I saw when I entered the art gallery was a notice which said:
走进展厅首先看到的是一张告示，上面写着