radius

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• ① 半径(参照diameter)
  • What [How long] is the radius of this circle?这个圆的半径是多少?

• ② 半径范围;(活动、能力等的)范围,区域<of>
  • The wreckage of the airplane was scattered over a radius of several miles.飞机的残骸散落在几英里半径的范围。
  • a half-mile radius半英里周围
  • within a radius of five miles周围五英里以内
  • the flying radius of an airplane飞机的飞行半径[续航范围]

• ③ 【解】桡骨(从肘到大拇指关节之长骨)