The veriation of swinging leg's knee angle should be controlled.
应控制摆动腿的膝角的最小角度。
Your front knee should be at around a 90-degree angle.
左腿膝盖弯曲，约成90度角。
He hit his knee against the Angle of the chair.
他的膝盖撞在椅子角上。
She hit her knee against the Angle of the bed.
她的膝盖撞到床角上了。
Angle changes of shoulder joint. Knee joint.
肩关节、膝关节和髋关节的角度变化。
Angle changes of shoulder joint. Knee joint.
肩关节、膝关节和髋关节的角度变化。
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