Backup Link A resilient (fault tolerant) link which is not used until the primary link fails. 备份链路弹性(容错)链路,主链路故障后启用。
It can be argued that having a backup link that's significantly smaller than your main one is a bit pointless, but at least you can set filters to let only the vital traffic through if your primary link fails. 也许有人会说，备一条容量远小于主路径的备用链路没有多大意义，但至少你可以设置过滤器，这样万一主链路出故障后，可以让那些重要流量通过。
The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
Do you have any backup if this machine fails? 如果这台机器坏了你有备用的吗?
We should always have a backup plan. 我们应该总是有备用的计划。