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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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