点击选择你要显示其地面轨迹的卫星名称。
Click on the object you wish to display a ground track of to select it.
如果你选择这个选项，在目录中选择卫星名称，使它高亮显示。
If you select this option, highlight the name of the satellite in the list at the left side of the dialog.
对话框左边的目录显示了当前数据文件中的卫星名称及其按分钟计算的轨道周期。
The list on the left side of the dialog shows the names of all the objects in the current data file, together with each object's orbital period in minutes.
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