反之满足这一条件的点所构成的二阶曲线一定是椭圆。
On the other hand, the curve of second order composed with those points accord with above-mentioned factor is sure to an ellipse.
另外，利用顶点位置的调整，给出一条降阶曲线逼近原曲线的方法，同时考虑了它们的误差。
On the other hand, by adjusting the given vertices, an approximation method for degree reduction of bezier curve is presented and the error is estimated.
陈保亚提出的阶曲线理论为语言历史关系研究提供了两个重要的方法：概率计算法和阶曲线。
The Curve Theory of Ranks (CTR) proposed by Dr. Chen Baoya suggests two methods for the research in the field of historic relationships of languages: Probability Limit(PL) and the Curve of Ranks (CR).
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