The introduction of the 4th management layer means there are translation between layer at level three and four.
第四管理层的引入意味着,在第三和第四层之间的,一个转变。
Thus a management layer was removed, and the CEO gained a net three additional reports.
因此，一个管理层次被撤消，而CEO净增了三个直接向他汇报的人。
Hardware Abstraction Layer has three models of internal communication, virtual driver and equipment management.
硬件抽象层共分为内部通信模块、虚拟驱动模块和设备管理模块三部分。
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