n.半径范围；半径；桡骨；辐射区
Nobody is allowed to enter the operation radius. 不允许任何人进入工作半径范围以内。
What is the radius of this circle? 这个圆的半径有多长?
We can compute the circular area with radius. 我们能用半径计算出圆的面积。
The radius expands markedly at its lower end. 桡骨下端明显扩张。
