取一个向量场的散度。

OK, so you take the divergence of a vector field.

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如果说函数的梯度是向量，那么向量场的散度就是函数。

So, if the gradient of a function is a vector, the divergence of a vector field is a function.

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散度定理为我们提供了一种，计算向量场通过闭曲面的通量的方法。

So, the divergence theorem gives us a way to compute the flux of a vector field for a closed surface.

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