Moreover, virtualisation makes it much easier to add new servers or storage devices. Alternatively, firms can simply rent extra capacity from operators of what are called “computing clouds”, such as Amazon Web Services. That outfit has built a network of data centres in which virtual machines and disks can be launched in seconds. As a result, IT systems will increasingly no longer be a capital expense（注2）, but an operational cost（注3）, like electricity.
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Public computing clouds are open to anyone who wants to sign up and use them.
公共计算云面向任何希望登录到其中并使用它们的用户。
The mainframe may well find a new home in corporate computing clouds, the pools of data-processing capacity many firms are building.
大型机会在可以进行云计算的企业计算机市场找到自己的一席之地，很多公司都在建立自己的数据处理库。
Alternatively, firms can simply rent extra capacity from operators of what are called "computing clouds", such as Amazon Web Services.
如若不然，企业也能简单地从所谓的“计算云”运营商(如amazon Web Services公司)那租用额外磁盘容量。
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