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radian ['reidiən]    添加到生词本 复制网址
基本释义
  • n. 弧度
英英解释

  • 　1个名词解释

    1. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
      [同] rad, radian