radii

名词 radius:

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

1. An early instrument for measuring altitude of celestial bodies, consisting of a90= graduated arc with a movable radius for measuring angles.
   象限仪用来测量天体纬度的一种早期工具，由一个有90度刻度的圆弧和一个用来测量角度的可移动的半径构成
2. Moving or directed along a radius.
   沿着或向着半径移动的
3. Every family within a radius of25 miles of the city center.
   住在离城中心半径25英里的范围内的家庭
4. We can compute the circular area with radius.
   我们能用半径计算出圆的面积。

ra.di.i

n.（名词）
A plural of radius
radius的复数