Precession, basically is the change in the direction of earth's axis of rotation.
岁差，基本上是地球自转轴方向的改变。
Gears serve to transfer power and change the direction of rotation.
传动装置的作用是传送动力和改变旋转方向。
Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Stepping motor control by pulse, by changing the order of power to change the direction of rotation motor, change the pulse frequency may change the motor rotation speed.
步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
Maximum rate of change of left knee, is a proactive force to bring the body to throw the direction of lower limb rotation.
左膝关节速度变化最大，是积极主动用力来带动身体下肢向投掷方向转动。
Drag onto the page. Drag round rotation handle to change arrow direction; yellow diamond to resize line ends.
拖到绘图页上。拖动圆形旋转手柄可更改箭头方向；拖动黄色菱形可调整线端的大小。
Drag onto the page. Drag round rotation handle to change arrow direction; yellow diamond to resize line ends.
拖到绘图页上。拖动圆形旋转手柄可更改箭头方向；拖动黄色菱形可调整线端的大小。
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