不同的曲线形状，加速度变化量不同。
When curve line is different, the change of acceleration is different.
引起加速度变化的原因主要是轨道曲线形状。
The be reason for acceleration change is curve of the track.
第二个点和第三个点是确定曲线形状的控制点。
The second and third points are control points that determine the shape of the curve.
第二个点和第三个点是确定曲线形状的控制点。
The second and third points are control points that determine the shape of the curve.
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