We take a point on the geometry — the centroid — compute the value for that point on the space filling curve, and store the result in an additional column.
我们在几何图形上取一个点，即形心点，计算那个点在空间填充曲线上的值，并将结果存储在一个附加的列中。
The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
平面解析几何对“求过二次曲线外的点所引曲线切线的方程”的问题，未给出一般的方法和公式。
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