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A radian is the Angle subtended by an arc of a circle whose length is just equal to the radius.
一弧度就是长度刚好等于半径的一段圆弧所对的圆心角。
youdao
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The maximum tilt angle of the image is 0. 002 radian;
实验表明，图像旋转过程中允许的最大倾斜角度为0.002弧度；
youdao
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The maximum tilt angle of the image is 0. 002 radian;
实验表明，图像旋转过程中允许的最大倾斜角度为0.002弧度；
youdao