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。
The Angle subtended at the center of a sphere by an area on its surface numerically equal to the square of the radius.
在单位半径的球体中心对球表面上的投影面积所张的角。
We solved at the same time a pure mathematical problem by physical procedure i. e. calculating the solid angle subtended by a circular plate to any point in the space.
同时，用物理学方法解决了圆盘面对空间任意点所张的立体角的计算问题。
These subtended angles correspond to a viewing distance of roughly 2.2 times the screen width at the back row of the seating down to 1.5 times the screen width at the front.
这个观看角度是介于屏幕到最远观看距离应为电视屏幕宽度的约2.2倍和最前排观看距离为屏幕的约1.5倍之间。
The staminate flower is subtended by two leaf-like bracts. 150–200 stamens spirally arranged along the spike axis and the phyllome are located at the base of the spike axis.
雄花外侧是苞片， 每朵雄花上着生150–200个雄蕊，花轴基部着生少数退化的叶原体。
The staminate flower is subtended by two leaf-like bracts. 150–200 stamens spirally arranged along the spike axis and the phyllome are located at the base of the spike axis.
雄花外侧是苞片， 每朵雄花上着生150–200个雄蕊，花轴基部着生少数退化的叶原体。
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