中文说明：绘画出三阶的贝塞尔曲线， 求出曲线上各点的曲率和半径，可用于弯道设计
English Description：
The third order Bezier curve is drawn, and the curvature and radius of each point on the curve can be calculated, which can be used for the design of curve
Draw a Bezier curve of third order
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中文说明：绘画出三阶的贝塞尔曲线， 求出曲线上各点的曲率和半径，可用于弯道设计
English Description：
The third order Bezier curve is drawn, and the curvature and radius of each point on the curve can be calculated, which can be used for the design of curve