Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Big jobs--factories, shopping malls.
大的工程 ，工厂 ，大型购物中心。
His hand is swollen, Does it hurt?
他的手肿起来了，疼不疼？
My parents used to live in South America and I used to fly there from Europe in the holidays.
我的父母曾经住在南美洲，所以假期里我常从欧洲乘飞机到他们那里。