radius

/ˈreɪdiəs/ n.
标准词条 CET-4
一句话记住

半径;半径范围;桡骨

释义与例句

n. 半径;半径范围
a straight line from the centre to the edge of a circle; the distance from the centre of something to its edge
  1. The radius of the circle is five centimetres.
    这个圆的半径是五厘米。
  2. All houses within a radius of one mile were evacuated.
    一英里范围内的所有房屋都被疏散了。
展开其余 1 条例句
  1. The shop delivers to customers within a ten-mile radius.
    这家商店为十英里范围内的顾客送货。
n. 桡骨
the shorter of the two bones in the lower arm, between the elbow and the wrist
  1. He broke his radius when he fell off his bicycle.
    他从自行车上摔下来,摔断了桡骨。
  2. The radius runs alongside the ulna in the forearm.
    桡骨与尺骨并排位于前臂。
展开其余 1 条例句
  1. An X-ray showed a fracture in the radius.
    X光片显示桡骨有一处骨折。

词源与构词

记忆钩子 radius 是半径,diameter 是直径,别搞混;复数用 radii 或 radiuses。

词族与关联词

词族(同一词根派生出的不同词性或形式)
  • radii 半径(复数)
    radius 的复数形式,常用于数学或科技术语中。
  • radial 径向的;放射状的
    形容词,描述从中心向外辐射的方向或形状。
易混词(形近或义近,注意区别)
  • diameter 直径
    radius 是半径(圆心到边缘),diameter 是直径(穿过圆心的整条直线),diameter = 2 × radius。
    The diameter of the tree trunk was about one metre. 树干的直径约为一米。
常见搭配
  • within a radius of 在……范围内
    There are three schools within a radius of two miles. 两英里范围内有三所学校。
  • radius of action 活动半径;续航距离
    The aircraft has a radius of action of 800 kilometres. 这架飞机的续航距离为八百公里。