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。
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。
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