当对侧手向后推水，达到最快的划水速度和最大推进力的时候，移臂开始加速，驱动手掌前伸入水。
The arm recovery accelerates and the hand drives forward into the water while the opposite hand pushes back achieving maximum hand velocity and propulsion.
首先，推导了相机侧摆时焦平面各像元的像移速度求解公式，建立了侧摆角度与像移大小的一般关系式。
Firstly, the expression of the image motion of each pixel was deduced when the camera was scroll imaging, and the relationship between scroll Angle and image motion velocity was established.
首先，推导了相机侧摆时焦平面各像元的像移速度求解公式，建立了侧摆角度与像移大小的一般关系式。
Firstly, the expression of the image motion of each pixel was deduced when the camera was scroll imaging, and the relationship between scroll Angle and image motion velocity was established.
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