系统级错误包括语法错误、空指针异常、web服务超时、数据库连接超时等。
The system level error includes syntactical error, null pointer exception, web service timeout, database connection timeout, and so on.
通常，他们需要操作系统级的管理、包括操作系统补丁管理、他们还需要受管的安全服务。
Usually, they want management through the operating system level, including OS patch management, and often want managed security services as well.
一个可用系统是由一组系统级共享资源组成的系统，共同合作提供重要服务。
An available system is one that comprises a set of system-wide, Shared resources that cooperate to provide essential services.
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