大部分支持VIP的交换机也能支持主用系统或备用系统的策略，以便流量跑到主用系统那里，除非它不可用或验证失败。
Most switches that support a VIP can also support a policy of primary system or secondary system, so that traffic goes to the primary system unless it is unavailable or fails the validation.
方法和块能被“完全”编译，因此可以在eval不可用时使用define_method等一系列方法。
Method and block bodies can be compiled "completely", so it's possible to use define_method and friends even when eval isn't available.
如果你够幸运工个甚至能找到原先的文件并保存，把它救回来，将其标识为不可用恢复它。
If you're lucky, they can even find the file and save it, bring it back, mark it not available, undelete it.
如果你够幸运工个甚至能找到原先的文件并保存，把它救回来，将其标识为不可用恢复它。
If you're lucky, they can even find the file and save it, bring it back, mark it not available, undelete it.
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