第一层负责发现活动网络，轮询服务和设备是否出故障，以及截获或处理来自设备、服务或更高层分布式代理的异步事件。
It is responsible for active network discovery, polling for device outages and services, and intercepting or processing asynchronous events from devices, services, or higher level distributed agents.
这一层提供了一组通用函数供底层网络设备驱动程序使用，让它们可以对高层协议栈进行操作。
This layer provides a common set of functions to be used by lower-level network device drivers to allow them to operate with the higher-level protocol stack.
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).
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