定义设是三维空间中的光滑曲面，在上有界。
Definition let be a smooth surface in three-space, and let be bounded on.
用梭形旋转曲面包围三维有界场源，将位场的地表观测值延拓到场源之外的空间区域。
The earths surface observation is extended to the region beyond the source with a methodof sphere surrounding three-dimensional finite source.
用梭形旋转曲面包围三维有界场源，将位场的地表观测值延拓到场源之外的空间区域。
The earths surface observation is extended to the region beyond the source with a methodof sphere surrounding three-dimensional finite source.
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