Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Good for you.
我真为你高兴。
No. Thanks all the same.
不喝了。不过还是得谢谢你。
For hundreds of years, St.Bernard dogs have saved the lives of travellers crossing the dangerous Pass.
几百年来，圣伯纳德修道院驯养狗拯救了许多翻越这道山口的旅游者的生命。