我们知道fx和fy是,曲面上两条切线的斜率。

We know that f sub x and f sub y are the slopes of two tangent lines to this plane, two tangent lines to the graph.

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一个给定点的导数不过就是一条切线的斜率轻吻了那个点。

A derivative at a given point is just the slope of the tangent line that kisses that point.

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在曲面数字化方面，提出基于曲面曲率和被测点切线斜率的自适应采样规划。

During digitizing, the adaptive sampling planning method based on the curvature of surface and the slope of tangent line of measured point is proposed.

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At any point on the graph you can take the derivative, which will be tangent to the curve at each point, and its numerical value will be what you can call the instantaneous velocity of that point and you can take the derivative over the derivative and call it the acceleration.

在图上的任意一点,你可以进行求导,得到曲线上每一点的切线斜率,所得到的数值,即为该点处的瞬时速度,然后你再求一次导,得出它的加速度

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