云计算的一个承诺就是虚拟化将会减少所需服务器的数量，这会导致在硬件、软件许可证、能源和维修上的减少。

One promise of cloud computing is that virtualization will reduce the number of servers needed, leading to reductions in hardware, software licenses, energy, and maintenance.

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不好的一面是，由于虚拟化软件互操作性方面的问题，虚拟化后的服务器有可能不能从一个厂商转移到另一个厂商。

One downside is that virtualized servers may not be transferable from one vendor to another due to interoperability issues of the virtualization software.

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虚拟化对硬件进行了最大程度的抽象，甚至不需要将软件堆栈绑定到特定的物理服务器就可以执行部署和重新部署。

Virtualization completely abstracts the hardware to the point where software stacks can be deployed and redeployed without being tied to a specific physical server.

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