Tractrix
等切面曲线, 曳物线
🗣️ 情景例句
Look, they have a special offer on leather shoes.
看，他们这儿皮鞋有特殊优惠。
How will we know whether it can have a positive effect on the company?
我们怎么会知道它对公司能有积极的效果呢？
Yes, the economy model is about 30% less.
是的，经济型的大约便宜30%。