原始点在内部转换成立方贝塞尔控制点，因此没有返回原始点的机制。
The original points are converted to cubic Bézier control points internally, therefore there is no mechanism for returning the original points.
原始点在内部转换成立方贝塞尔控制点，因此没有返回原始点的机制。
The original points are converted to cubic Bézier control points internally, therefore there is no mechanism for returning the original points.
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