1. This approach leverages the simplicity of a flat, switched network, but implements routing where necessary for security, broadcast containment or address management. 
   此方法利用了平面、交换网络的简洁性，但在为安全性、广播包容或地址管理需要的地方用路由。
2. In the event that the destination MAC address does not appear in the ARP cache -- it might have timed out, for instance -- the router must broadcast an ARP request to the subnet referenced by the packet's destination IP address.The endstation with that IP address responds, sending back its MAC address.The router updates its cache, installs the new MAC address into the packet header and launches the packet. 
   万一目的地的mac地址没有出现在arp高速缓存中（例如，有可能超时了），路由器必须向与包的目的ip地址有关的子网广播一个arp请求，拥有此ip地址的端站就作出响应，把mac地址发送回去，路由器因此更新高速缓存，把新的mac地址装进包的报头并发送该包。
3. VLANs are most commonly segment- or port- based, requiring network administrators to define manually VLAN associations that form broadcast domains based on organizational functions rather than accidents of physical location or IP address assignment. 
   vlan最常见的是基于网段或端口，需要网络管理员人工定义vlan的关联性，这构成了基于组织功能的广播域，而不是基于物理位置或ip地址分配的偶然性。
4. When the BUS receives a broadcast packet, it sends out one copy to each of the registered LECs, which in turn translates it back to an Ethernet packet with the broadcast address before passing it to the client's protocol stack. 
   当bus收到广播包时，就向每个注册的lec发送一个副本，在把它送给客户机协议堆栈之前，lec再把它依次翻译成具有广播地址的以太网包。
5. China Broadcast Traditional Orchestra 
   中国广播艺术团民族乐团

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