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单词 radius
释义 ra·diusBrE /ˈreɪdiəs/NAmE /ˈreɪdiəs/ noun (
plural
radii BrE /ˈreɪdiaɪ/ NAmE /ˈreɪdiaɪ/
)
a straight line between the centre of a circle and any point on its outer edge; the length of this line 半径(长度)   compare diameter (1)
a round area that covers the distance mentioned from a central point 半径范围;周围They deliver to within a 5-mile radius of the store. 他们给店铺方圆 5 英里内送货上门。
(anatomy 解剖学) the shorter bone of the two bones in the lower part of the arm between the elbow and the wrist, on the same side as the thumb 桡骨   see also ulna
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