network relay

例句：

1. 1. The network relay is essential for maintaining the connectivity between different networks.
   网络中继器对于保持不同网络之间的连接至关重要。
2. 2. The router is responsible for forwarding packets between the local area network and the wide area network.
   路由器负责在局域网和广域网之间转发数据包。
3. 3. The switch is used to connect devices in a network and to facilitate communication between them.
   交换机用于连接网络中的设备，并促进它们之间的通信。