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单词 radian
释义 ra·dianBrE /ˈreɪdiən/NAmE /ˈreɪdiən/ noun (geometry 几何) a unit used to measure an angle, equal to the angle at the centre of a circle whose arc is the same length as the circle's radius 弧度
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更新时间:2025/8/24 5:13:35