这个就是散度公式了，告诉大家一些相似的东西，仅仅是对被闭合曲面包围的空间区域来讲的。
This one here, the divergence theorem, tells you something similar but now for a region of space bounded by a closed surface.
这个就是散度公式了，告诉大家一些相似的东西，仅仅是对被闭合曲面包围的空间区域来讲的。
This one here, the divergence theorem, tells you something similar but now for a region of space bounded by a closed surface.
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