因此，当发生故障时，该适配器就成为服务器适配器的浮动地址背后的物理地址。
Therefore, this adapter becomes the physical address behind the floating address of the service adapter when a failure happens.
如果那时两个适配器中有一个发生故障，那么就没有额外的备用适配器来用作备份了。
If one of the two adapters fails at that point, then there is no additional standby adapter to be used as a backup.
如果服务器发生了故障，会话状态就丢失了，那么用户就会体验到非常奇怪的浏览器行为“为什么我又回到主页上来了？”
If a server fails, the session state goes away and users experience odd browser behavior " Why am I back to the home page?"
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