方向基本和这里的单位切向量一致。

And, the direction is essentially that of a vector.

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那么如果我选择了任何位于切平面的向量。

Then, if I choose any vector in that tangent plane.

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然后利用法向量得出切平面的方程。

And then get this equation for the plane using the normal vector.

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然后利用法向量得出切平面的方程。

And then get this equation for the plane using the normal vector.

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