radius

美 [ˈreɪdiəs]
英 ['reɪdiəs]
  • n.桡骨;半径范围;半径(长度);周围
  • 网络远程用户拨号认证系统(remote authentication dial in user service);界限;辐射光线
复数:radii  复数:radiuses  
radius
n.
1.
半径(长度)a straight line between the centre of a circle and any point on its outer edge; the length of this line
2.
半径范围;周围a round area that covers the distance mentioned from a central point
They deliver to within a 5-mile radius of the store.
他们对距离店铺 5 英里的范围内送货上门。
3.
桡骨the shorter bone of the two bones in the lower part of the arm between the elbow and the wrist, on the same side as the thumb

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