[ 'reidiәs ]
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
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