radius
/ˈreɪdiəs/
n.
标准词条
CET-4
一句话记住
半径;半径范围;桡骨
释义与例句
n.
半径;半径范围
a straight line from the centre to the edge of a circle; the distance from the centre of something to its edge
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The radius of the circle is five centimetres.
这个圆的半径是五厘米。
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All houses within a radius of one mile were evacuated.
一英里范围内的所有房屋都被疏散了。
展开其余 1 条例句
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The shop delivers to customers within a ten-mile radius.
这家商店为十英里范围内的顾客送货。
n.
桡骨
the shorter of the two bones in the lower arm, between the elbow and the wrist
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He broke his radius when he fell off his bicycle.
他从自行车上摔下来,摔断了桡骨。
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The radius runs alongside the ulna in the forearm.
桡骨与尺骨并排位于前臂。
展开其余 1 条例句
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An X-ray showed a fracture in the radius.
X光片显示桡骨有一处骨折。
词源与构词
记忆钩子
radius 是半径,diameter 是直径,别搞混;复数用 radii 或 radiuses。
词族与关联词
词族(同一词根派生出的不同词性或形式)
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radii 半径(复数)radius 的复数形式,常用于数学或科技术语中。
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radial 径向的;放射状的形容词,描述从中心向外辐射的方向或形状。
易混词(形近或义近,注意区别)
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diameter 直径radius 是半径(圆心到边缘),diameter 是直径(穿过圆心的整条直线),diameter = 2 × radius。The diameter of the tree trunk was about one metre. 树干的直径约为一米。
常见搭配
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within a radius of 在……范围内There are three schools within a radius of two miles. 两英里范围内有三所学校。
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radius of action 活动半径;续航距离The aircraft has a radius of action of 800 kilometres. 这架飞机的续航距离为八百公里。