Use geometry or you need to set up for double integral of a surface.
总之，就是用几何方法或是在曲面上建立二重积分。
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Double integral of F.dS or F.ndS if you want, and to set this up, of course, I need to use the geometry of the surface depending on what the surface is.
This is a typical optical, mechanical, electronic and calculated integral system and can be applied to the geometry and dynamic measurement of MEMS microstructure.