Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Mr Wang, I'd like you to meet my brother, Haitian.
王先生，我想请你见见我弟弟，海天。
He was pale with fear.
她吓得脸色刷白。
I don't have any cash with me.
我身上没带现金。