Angle changes of shoulder joint. Knee joint.
肩关节、膝关节和髋关节的角度变化。
The leg in a maximum angle, the foot is torn towards the shoulder.
腿弯到最大的角度，脚则指血肩膀方向。
The shoulder hip intersection angle appears from minor to changing greatly again law;
肩髋夹角呈现由小到大再变小的规律；
The shoulder hip intersection angle appears from minor to changing greatly again law;
肩髋夹角呈现由小到大再变小的规律；
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