英文字典中文字典Word104.com
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radian n. 弧度 弧度 radian 弧度 radian 弧度 弳 radian n 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) [synonym: {radian}, {rad}] |
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