This paper introduces the system structure of USB KEY: the hardware layer, the core driver layer, the standard middle-ware layer and the application layer.
本文介绍了USB KEY的体系结构，由硬件层、核心驱动层、标准中间件层和应用层构成。
The object group includes information layer, target layer, function layer and hardware layer while the relation group includes coordination layer and execution layer.
对象类中包括信息层、目标层、功能层和硬件层，关系类中包括协调层和执行层。
The object group includes information layer, target layer, function layer and hardware layer while the relation group includes coordination layer and execution layer.
对象类中包括信息层、目标层、功能层和硬件层，关系类中包括协调层和执行层。
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