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词汇 radian
释义
radian
noun [ C ] mathematics specialized uk/ˈreɪ.di.ən/ us/ˈreɪ.di.ən/
弧度
the measure of an angle at the centre of a circle opposite an arc (= part of the edge of a circle) that is the same length as the radius (= the line from the centre to the edge of the circle)
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