主要设备类型如下。
顶部的那层叫做较高层，代表的是内核针对SCSI和主要设备类型的驱动器的最高接口。
At the top is what's called the upper level, which represents the highest interface of the kernel for SCSI and drivers for the major device types.
至于移动设备，我们可以区分出三种主要平台类型：软件平台，应用平台与沟通平台。
Focusing on mobile devices, we can distinguish between three main platform types: software platforms, application platforms and communication platforms.
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