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.
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。
HAR1 is expressed before birth in the developing neocortex—the outer layer of the brain that seems to be involved in higher functions such as language, conscious thought and sensory perception.
HAR1在妊娠期的新皮质——大脑的外层，可能同语言、意识思维和感知等高级功能有关——发育期间开始表达。
An LEC emulates a LAN interface to higher layer protocols and applications. It forwards data to other LANE components and performs LANE address resolution functions.
一个LEC仿真了一个LAN接口为一个更高层的协议和应用。它将数据转发到另一个LANE成员并完成LANE地址解析服务。
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