为什么要说F是一个梯度场？
F I have my surface and I have my vector field f.
有一个曲面，还有一个向量场。
But it's a new vector field that you can build out of f.
这是一个新的向量场，可以用f来建立。
Say that f, our vector field is actually the gradient of some function.
也就是向量场f实际上是一个函数的梯度。
Say that f, our vector field is actually the gradient of some function.
也就是向量场f实际上是一个函数的梯度。
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