| 释义 |
ra·diusBrE /ˈreɪdiəs/NAmE /ˈreɪdiəs/ noun (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 |
