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