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.

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FSH在协议层操作，不提供限制网络资源的能力，这样，没有一个应用程序能垄断网络栈。

The FSH operates at the protocol layer and does not provide the ability to constrain network resources such that no one application can monopolize the network stack.

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从逻辑上看，UNET低级库是一个建立在UDP之上的网络协议栈。它包括一个“网络”层和一个“运输”层。

Logically, the UNET low level library is a network protocol stack built on top of the UDP, containing a "network" layer and a "transport" layer.

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