基于机群的可扩展计算机网络已逐渐成为高性能网络服务器架构的基础。

Cluster-based systems have become the foundation of the architecture of high-performance Web servers.

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它可广义定义为使用有公司环境以外提供的，按使用次数付费的可扩展计算资源。

It can be loosely defined as using scalable computing resources provided as a service from outside a company's environment on a pay-per-use basis.

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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.

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