radius

单词音标

radius音标[\'reidiәs]

汉语翻译

n. 半径, 范围, 辐射光线

【电】 半径

词型变化

名词复数:radii

英语解释

名词 radius:

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

同义词：r

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

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

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

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

同义词：spoke, wheel spoke

例句

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

We can compute the circular area with radius.

我们能用半径计算出圆的面积。

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。

详细解释

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]