ra·di·us
noun/ˈreɪdiəs/
/ˈreɪdiəs/
(plural radii
/ˈreɪdiaɪ/
/ˈreɪdiaɪ/
)- a straight line between the centre of a circle and any point on its outer edge; the length of this line
enlarge image半径（长度） - a round area that covers the distance mentioned from a central point
半径范围；周围 - within a… radius 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。 - Doctors wish to examine everyone living within a 10-mile radius of the factory.
医生希望对工厂方圆 10 英里范围内的每个人进行检查。
- within a… radius They deliver to within a 5-mile radius of the store.
- (anatomy) 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
enlarge image桡骨
Word Originlate 16th cent. (in sense (3)): from Latin, literally ‘staff, spoke, ray’.