目前在世界的许多地方，你在租用汽车时都会获得一个导航系统，它是显示在屏幕上的一张小型电子地图，可以发出机器声音。
Now, in many parts of the world, when you hire a car, you get a navigation system — a little electronic map on a screen with a machine voice.
为了有效地描述实际道路网络，提高汽车导航系统的运行效率，建立了一种新的电子地图的路网模型。
To effectively describe the real road network and improve the efficiency of vehicle navigation system, a road network model in digital map is created.
GPS汽车导航定位系统由GPS定位系统、电子地图、嵌入式系统组成。
The vehicle Autotracking and Positioning system is comprised of a GPS receiver, a digital map and a embed system.
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