n. 半径, 范围, 辐射光线

[电] 半径

n. the length of a line segment between the center and circumference of a circle or sphere

n. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

n. a circular region whose area is indicated by the length of its radius

n. the outer and slightly shorter of the two bones of the human forearm