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TOEFL IELTS BNC: 7090 COCA: 9413
radius
/ˈreɪdiəs ||; ˈredɪəs/noun [C] (plural radii) /-diaɪ ||; -dɪˌaɪ/
1 the distance from the centre of a circle to the outside edge 半径 ☞Look at diameter and circumference. 参看diameter及circumference。 ☞picture at circle 见circle插图
2 a circular area that is measured from a point in its centre 半径范围: The wreckage of the plane was scattered over a radius of several miles. 飞机的残骸散落在方圆数英里的地方。
3 (medical医学) the shorter bone of the two bones in the lower part of your arm between your wrist and your elbow 桡骨 ☞Look at ulna. 参看ulna。 ☞picture at body 见body插图

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