radius brick

例句：

1. 1.The circle has a radius of 5 units.
   这个圆的半径是5单位。
2. 2. The car's wheelbase is the distance from the front to the rear wheel.
   汽车的轴距是从前轮到后轮的距离。
3. 3.The planet's orbital radius is 60,000 kilometers.
   这个行星的轨道半径是60,000公里。