为第一条曲线创建起始点、结束点和两个控制点；为第二条曲线创建结束点和两个控制点。
Creates the start, end, and two control points for a first curve and endpoint and two control points for a second curve.
为第一条曲线创建起始点、结束点和两个控制点；为第二条曲线创建结束点和两个控制点。
Creates the start, end, and two control points for a first curve and endpoint and two control points for a second curve.
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