相比于为云重写代码，在虚拟化中你只需要将你现有的代码，放在可以根据需要动态扩展的虚拟机映像中即可。
Instead of rewriting for the cloud, you use a hosting company that puts your existing code on VM images that can be dynamically scaled as demand changes.
开始映像扩展流程之前的最后一个配置步骤就是进行虚拟机硬件的配置。
The last configuration step before the image extension process begins involves the virtual machine’s hardware configuration.
为了能够通过安装定制软件来定制您的操作系统环境，WebSphere CloudBurst引入了扩展虚拟机的概念。
To enable you to customize your operating system environment by installing custom software, WebSphere CloudBurst introduces the idea of extending virtual images.
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