Think in terms of a subway map, but add in layers of data like water and sewer lines, power grids, and real time traffic information.

例如，在地铁地图上增加其他一些数据，如供水和排水管道、电网和实时交通信息等。

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For instance, it makes sense to cache map data to reduce response time, but it's often impossible or impractical to cache results of search queries or real-time traffic information.

比如，可以缓存地图数据来减少响应时间，但通常并不适合将搜索查询结果或者实时交通信息进行缓存。

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For example, a mash-up might pull data - such as weather information, traffic information, and a map - from three unique sources.

例如，一个聚合应用程序可能从三个不同的数据源提取数据，如天气信息、交通信息和地图。

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Both systems utilize Clear Channel's Total Traffic Network1 service to provide an overlay of real-time traffic events and conditions on the navigation map and allow users to create routes (or re-route) to minimize traffic delays.

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Version 1.8 also includes safety camera alerts as an In App Purchase, an at-a-glance traffic gage and a new NAVTEQ map.

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For example, for Stanford University a device could eventually show you a 3D map of the campus with real-time traffic information, information about your lecture room and the class there, information about the subject there, such as biology in 3D, and so on.

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