虚拟化的一个优势就是扩展了计算硬件的功能，可允许一台计算机(主机)通过运行多个客户操作系统实现多个角色。
An advantage of virtualization is extending the utility of computing hardware, enabling a single computer (the host) to fulfill several roles by running multiple guest operating systems.
这是因为每个客户操作系统都了解自己正在虚拟化模式中运行，因此每个系统都与系统管理程序协作，来实现底层硬件的虚拟化。
This is because each guest operating system is aware that it's being virtualized, so each cooperates with the hypervisor to virtualize the underlying hardware.
动态迁移(Live migration)允许操作系统及其应用程序迁移到新的服务器上，从而实现负载在可用硬件上的均衡。
Live migration allows an operating system and its applications to be migrated to a new server to balance the load over the available hardware.
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