And the paper gives a simple formula which can make the ground tracks of the orbit repeat and recover the whole globe.
并且提出了使得地面轨迹形成覆盖循环所需要满足的简要公式。
Also ring racing was popular on asphalt and ground tracks. It was enough to have a modified road car to take part in the racing.
另外在沥青路面和赛道上进行的环形竞速也广受欢迎，那些参赛的车辆都进行了足够的改良。
The ground tracks of satellites required for mission should be maintained close to those of reference orbits over the lifetime of satellites.
轨道维持的任务是将卫星的星下点轨迹保持在设计的参考轨迹附近。
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