处理器能力被划分为时间片，应用程序映像经常被换入和换出真实内存，设备访问由需求驱动，还受到访问权限的限制。
Processor capacity is doled out in slices, application images are constantly shuffled in and out of real memory, and device access is driven by demand and policed by access rights.
通过虚拟化，以前在定制环境中运行的应用程序现在可以被复制或“映像化”，从而在供应商服务器的云中运行。
Through virtualization, applications that formerly ran in custom environments can be duplicated, or "imaged," to run in the cloud on the vendor servers.
第二个(可能更重要的)原因是：他们的应用程序已经在此映像上测试和“认证”过了。
The second and probably the best reason: Because their application has been tested and "certified" on this image.
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