本文从软件和硬件两个层面介绍了公交车载设备的实现原理与关键技术，并在实验部分给出设备的实例。
In this paper, from two aspects of software and hardware, the implement principle and the key technologies of vehicle device are introduced, and the device case is presented at the experiment segment.
实体的实例会持久化到移动设备本身的本地数据库中。
Instances of entities will be persisted to a local database on the mobile device itself.
因此，必须先创建数据库服务器和表，然后才能够让这个设备创建这个模式的实例。
As a result, the database server and tables will need to be created before the appliance is directed to create an instance of this pattern.
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