尽管2级“胖客户端”应用的开发很简单，但是任何用户接口或者业务逻辑的改变所导致的软件升级都需要在所有客户端上进行。
Two-tier thick client applications are easy to develop, but any software upgrade because of changes in user interface or business logic has to be rolled out for all the clients.
本文采用了基于STR720的车载GPS设备的设计，并通过USB、UART接口升级软件，使用电子地图有效的对汽车进行定位。
This paper presents a design of vehicle GPS device based on the STR720, and through USB, UART interface upgrade software. Electronic maps can be effectively used in positioning of the car.
本文采用了基于STR720的车载GPS设备的设计，并通过USB、UART接口升级软件，使用电子地图有效的对汽车进行定位。
This paper presents a design of vehicle GPS device based on the STR720, and through USB, UART interface upgrade software. Electronic maps can be effectively used in positioning of the car.
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