类似地，对于一个可扩展的系统，我们想增加用户或服务器的数目，或系统的负载，这些变更不会因此明显的改变。
Similarly, we might increase the number of users or servers, or overall load on the system. In a scalable system, this should not have a significant effect.
真正的原因是它是一种简单的,并且实际的方式,用来描述具有有限数目的明确能量的系统。
The reason, really, is because it's a simple and also realistic way of portraying a system that has a finite number of well-defined energies.
虚拟处理器的数目，特别是 CPU 虚拟处理器的数目应该与系统中物理 CPU 成合适的比例。
Number of virtual processors especially the number of CPU virtual processors should be in proper ratio with physical CPU in the system.
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