MAC addresses are not part of any protocol that gets routed, you will never get the MAC address of a machine that is on the other side of a router or switch.

MAC地址是没有任何协议，获取路由的一部分，你将永远不会得到一个在路由器或交换机的MAC地址，另一侧机。

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The electric switch machine is an essential part of the railway signal system and plays an important role in guaranteeing the safety of the trains and promoting the transportation efficiency.

电动转辙机是铁路信号系统的关键设备，对保障行车安全、提高运输效率具有极其重要的作用。

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