Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Same to you.
你也一样。
Does everyone have enough to drink?
诸位喝得尽兴了没有？
She got up before 7 o'clock in the morning, and quickly washed her hands and face.
00以前起床，快快地洗手洗脸。