Each device class defines a set of semantics and a programming interface that devices of that class adhere to.
一个设备类用来描述一个类型的设备，想声音和网络设备。下面的设备类已经被系统确定。
Class hold values extracted from the XML configuration for each hardware device.
类来保存从每个硬件设备的XML配置中提取的值的实例。
For any given device, each mobile control class can have a unique control adapter class associated with it, and each instance of a control is bound to a corresponding instance of an adapter.
针对任何提供的装置，每个行动控制项类别可以有唯一与其相关联之控制项配接器类别，而每个控制项的执行个体会系结至相对应的配接器执行个体。
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