radius

名词 radius:

1. the length of a line segment between the center and circumference of a circle or sphere
   同义词：r
2. a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)
3. a circular region whose area is indicated by the length of its radius
4. the outer and slightly shorter of the two bones of the human forearm
5. support consisting of a radial member of a wheel joining the hub to the rim
   同义词：spoke, wheel spoke

1. The radius of a circle described by a crank, cam, or similar machine part.
   (曲轴的)半径曲柄、凸轮或类似机器部件形成的圆的半径
2. We can compute the circular area with radius.
   我们能用半径计算出圆的面积。
3. The police searched all the woods within a six-mile radius.
   警察搜索了在周围六英里以内的树林各处。

ra.di.us

n.（名词）
【复数】 ra.di.i[-dô-o.] 或 ra.di.us.es
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：
例句：
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：
例句：
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

来源：
Latin [ray]
拉丁语 [射线]