radii的中文意思、音标与词形变化

pl. 半径 [医] 半径, 辐射线(解)

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 n support consisting of a radial member of a wheel joining the hub to the rim