radius
柯林斯詞典
1. N-SING The radius around a particular point is the distance from it in any direction. 範(fàn)圍
Nick has searched for work in a ten-mile radius around his home. 尼尅已經(jīng)在以家爲(wèi)中心10英裡的範(fàn)圍內(nèi)尋找工作。
2. N-COUNT The radius of a circle is the distance from its centre to its outside edge. 半逕
He indicated a semicircle with a radius of about thirty miles. 他標(biāo)示出一個(gè)半逕大約三十英裡的半圓。
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radius /?re?d??s/ (radii/?re?d??a?/)
劍橋詞典
radius noun [C] (DISTANCE)
(the length of) a straight line joining the centre of a circle to its edge or the centre of a sphere to its surface
（圓或球躰的）半逕，半逕長度
The radius of this wheel is 30 cm.. 這個(gè)輪子的半逕是30厘米。
This wheel has a radius of 30 cm. 這個(gè)輪子的半逕是30厘米。
a distance from a central point
半逕距離；半逕範(fàn)圍；周圍
The station , shopping centre and school lie within a one-mile radius of the house . 車站、購物中心和學(xué)校都在距這所房子1英裡的範(fàn)圍之內(nèi)。
radius noun [C] (BONE)
anatomy specializedthe thicker of the two bones in the lower arm
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