The robot has straight lining, different radius and zero radius circle moving modes, and it can realize the robot quickly accomplishes moving and positioning in the millimeter scales in a huge range.

该机器人具有直线运动、任意半径圆周运动两种运动方式，能实现大范围内的快速移动定位，定位精度可达毫米级。

youdao

That is a circle of radius 1. That's the unit circle.

是一个半径为1的圆，那是单位圆。

youdao

I am trying to solve, actually, for the radius of the circle.

我是在试着，去解圆的半径。

youdao

That means, it can only be rattling around in a circle of radius R.

也就是说它只能,限制在一个半径为 R 的圆上运动

耶鲁公开课 - 基础物理课程节选

So we know it's moving on a circle of radius r.

因此这个质点始终在做半径为 r 的圆周运动

耶鲁公开课 - 基础物理课程节选

In Navevo's case the data will be used to flash a warning symbol on its sat-nav maps when a driver approaches a "warning zone" with a 50m (164ft) radius circle drawn around the area.

BBC: Navevo sat-nav offers cyclist alerts to lorry drivers