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词汇	radius
释义	ra·di·us AHD[rāʹdē-əs] D.J.[ˈreɪdiːəs]K.K.[ˈrediəs]n.（名词）【复数】 ra.di.i[-dē-ī'] 或 ra.di.us.es Carlyn Iverson Abbr. R,r,rad.Mathematics 缩写 R,r,rad.【数学】 A line segment that joins the center of a circle with any point on its circumference.圆半径：将圆心与圆周上任一连接起来的线段 A line segment that joins the center of a sphere with any point on its surface.球半径：将心与球面上任一点起来的线段 A line segment that joins the center of a regular polygon with any of its vertices.将正多边形的中心与它的一任一顶点起的来的线段 The length of any such line segment.半距离：这种线段的长度 A circular area measured by a given radius:半径范围：以某一半径所计的圆形地区：every family within a radius of 25 miles of the city center.住在离城中心半径25英里的范围内的家庭 A bounded range of effective activity or influence:活动半径：有效活动或影响的边界范围：the operating radius of a helicopter.直升飞机的作战半径 A radial part or structure, such as a mechanically pivoted arm or the spoke of a wheel.辐射部分：辐射形的部件或结构，如机械上有轴的臂或车轮的辐条 Anatomy 【解剖学】 A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located on the lateral side of the ulna.桡骨：一种长的、棱柱状、微弯的内头，两根前臂骨中较短较粗的一根，位于尺骨的后侧 A similar bone in many vertebrates.桡骨：许多脊椎动物具有的类似的骨头 Etymology语源 Latin [ray] 拉丁语 [射线]
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