如果主服务器不可用，但客户机尚具有网络连接，就需要故障转换到备用服务器，而不是使用系统时间。
If the primary server is unavailable, but the client still has network connectivity, you want to fail over to a secondary server as opposed to using system time.
更准确地说，他们都假设这些学生对其中的某种语言已经有足够的基础，因此一堂系统或者网络的操作课程很少有时间来训练编码的设计或者易读性。
Rather, they assume students have sufficient grounding in one language or another, so a course in operating systems or networks seldom includes any time devoted to coding style or readability.
尽管关注的重点是页面装载时间和用户体验，但是也不要忽视核心系统指标，比如磁盘、内存和网络。
Despite the focus on page loading times and user experience, it is important not to lose sight of the core system metrics such as disk, memory, CPU, and network.
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