操作系统的目的之一就是把底层硬件的特性给封装起来，然后提供一个统一的接口，以便于计算机操作人员控制硬件。
The purpose of the OS is to encapsulate all the intricacies of the underlying hardware and provide a unified access interface to the computer's parts. No application can access the hardware directly.
硬件抽象层利用底层微内核提供的API对底层硬件和外设进行访问和控制，提供一个抽象硬件平台和统一的硬件接口。
We provided an abstract hardware platform and a unified hardware interface by the use of the underlying microkernel APIs for the underlying hardware and peripherals to access and control.
作为蓝牙模块和主机间的软硬件接口HCI，可对控制基带与链路控制器、链路管理器、状态寄存器等硬件提供统一接口。
It also can create a wireless network betwixt digital device. HCI is the interface between software and hardware of Bluetooth module and host.
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