cycloid

n.[几]摆线,轮转线adj.圆形的,循环性格的

a curve traced by a point on the circumference of a circle as it rolls along a straight line.

名词

1. The motion of a cycloid can be described by parametric equations.
一个摆线的运动可以用参数方程描述。

2. The shape of a cycloid is often used in the design of gears and cam mechanisms.
摆线的形状常用于齿轮和凸轮机构的设计中。