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.
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。
The upper level of the SCSI subsystem represents the highest-level interface from the kernel (the device level).
SCSI子系统的较高层代表的是内核（设备级）最高级别的接口。
The upper level of the SCSI subsystem represents the highest-level interface from the kernel (the device level).
SCSI子系统的较高层代表的是内核（设备级）最高级别的接口。
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