Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
I ate eggs and drank mild for breakfast today.
我今天早餐吃了鸡蛋和喝了牛奶。
We aren't happy with the present situation.
我们不满足于现状。
The train was traveling at 120 miles an hour.
火车时速一百二十英里。