如果网络接口失效，需要用替代路径进行路由。
If a network interface goes down, traffic needs to be routed over an alternate path.
它提供了一个替代路径的血液旅行。
It provides an alternative path for the blood to travel through.
用脑力激荡法穷举可能的失败条件与替代路径成功条件。
Brainstorm and list possible failure conditions and alternate success conditions.
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