滑动条左侧的空间显示当前选择的项，如果是正在执行的搜索将显示选择项的完整路径。
The space to the left of the slider shows the currently selected item, including a full path to the item if a search is being performed.
它应具备以下功能：地图显示、地址匹配、地图匹配、最佳路径搜索、路径导航等。
It should possess functions as follows: map display, address matching, map matching, optimal route searching, route navigating, and so on.
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