我国粮食分布重心轨迹特征是：（1）位于东南；
The charaeteries of pathway of the centre of gravity of grain distribution in China are as follows:1.
系统通过压力平板采集重心轨迹信息经USB输送到计算机。
The system acquires information of centre-of-gravity path, which is transferred from force platform to computer via USB.
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.
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