Because only two points a straight decisions, and in between the two curves can be used an infinite number of cubic polynomial approximation.
因为，两点只能决定一条直线，而在两点间的曲线可用无限多的三次多项式近似。因此，为使结果具有唯一性。
Because only two points a straight decisions, and in between the two curves can be used an infinite number of cubic polynomial approximation.
因为，两点只能决定一条直线，而在两点间的曲线可用无限多的三次多项式近似。因此，为使结果具有唯一性。
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