所有的电子邮件处理策略、技巧及我所见过的邮件系统，都建立在两个基本假设上。
All the email tips, strategies and systems I have seen - my own included - rest on two fundamental assumptions.
高可用性是在系统、组件或者应用程序发生故障时快速恢复基本服务的系统管理策略。
High availability is the system management strategy of quickly restoring essential services in the event of system, component, or application failure.
这种策略要求您了解基本操作系统内核提供的机制，并在程序逻辑中利用这些机制设计信号量使用方法。
This tactic requires that you review what the base OS kernel provides or advises in terms of designing the use of semaphores within your program logic.
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