英汉词典

1. 半径范围；半径距离
    The radius around a particular point is the distance from it in any direction.

radius什么意思

    e.g. Nigel has searched for work in a ten-mile radius around his home.
           奈杰尔一直在他家周围10英里的范围内找工作。

2. 半径
    The radius of a circle is the distance from its centre to its outside edge.

    e.g. He indicated a semicircle with a radius of about thirty miles.
           他标示出了一个半径大约为30英里的半圆形。