How can any criterion of reliable knowledge be chosen, unless we already have some reliable criterion for making that choice?
除非我们已经拥用了有可信赖的选择标准，不然我们又将如何做出选择呢？
Your choice of hardware and software may be different, but the main hardware criterion is that your processor should have hardware virtualization available—it's a must in order to use KVM.
选择的硬件和软件可能有所不同，但是主要的硬件标准是您的处理器应当具有硬件虚拟化特性 — 这是使用 KVM 的必要条件。
The only criterion of the choice is that the relative orbit is clear.
选择的唯一准则是相对轨迹清楚。
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