Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Emergency Assistance, may I help you?
紧急事故救援中心，有什么需要帮助的吗？
Old birds are not to be caught with shaff.
老谋是不会失算的。
It's only a party in honor of my birthday.
这只是为了庆祝我的生日而举行的晚会。