radius

1. N-SING The radius around a particular point is the distance from it in any direction. 范围

Nick has searched for work in a ten-mile radius around his home. 尼克已经在以家为中心10英里的范围内寻找工作。

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

He indicated a semicircle with a radius of about thirty miles. 他标示出一个半径大约三十英里的半圆。