Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.
匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。
2
Like racing cars that swerve and hit each other on a circular track, the moons' speed relative to each other is low because they travel in nearly the same orbit.
这有点像是突然转向的赛车在环形赛道上相撞，月亮们也在同一轨道公转，所以他们之间的相对速度很小。
3
For high speed machining, circular arcs can be added to the corners on the roughing passes. These are true, circular arcs.