游泳运动员在空中时，身体重心的运动轨迹一经确定，就不会因为任何一种身体动作而有所改变。
Once a swimmer is in the air the trajectory of the center of gravity is set and cannot be changed by any body movements.
运用生物力学的研究方法对我国优秀男子跳远运动员的起跳过程进行研究，得出我国优秀男子跳远运动员在起跳过程中身体重心的运动轨迹、重心速度、位移等运动变化情况，研究了摆动腿的运动特征。
Through biomechanical analysis of top Chinese long jumper's take off, we learned that the moving track, speed, displacement of body's center of gravity and kinematics character of leg in the take off.
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