可以用时间滑块来设置时间间隔，如图 7 所示。
The time interval can be set using the time slider as shown in Figure 7.
使用 Google Earth 的时间滑块功能（包括动画和总时窗选择）将帮助为整个地理区域的用户可视化得到的可用性地图。
Using Google Earth's time-slider feature, including animation and total time window selection, helps visualize the resulting availability map for users throughout a geographic area.
通过拖动滑块按时间浏览可视化地图，或者按下播放按钮显示动画。
Move through the visualization in time by dragging the slider, or press the play button to show an animation.
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