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This kind of interaction for three dimension can be investigated easy by using the obtained result and coordinate transformation.

利用所得结果以及坐标变换可以研究三维体系内粒子间的电磁相互作用。

In print ing,the surface area taken up by type of a given size.

在印刷技术中，给定尺寸的铅字所占有的表面积。