在这里，我们使用传统的连接后端系统的低层接口而不是成熟的服务来创建复合解决方案。

Here, we are creating composing solutions using traditional low level interfaces to backend systems rather than using mature services.

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文件描述符是低层的输入和输出接口。

File descriptors are low-level interfaces to input and output.

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最后是较低层，代表的是适用于SCSI的物理接口的实际驱动器(参见图3)。

Finally, there's the lower level, which represents the actual drivers for the physical interfaces that are applicable to SCSI (see Figure 3).

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