对于开发人员来说，WPF 的好处在于它做了很重要的资源管理工作，但却使得直接控制硬件变得困难起来。
WPF does significant resource management on the behalf of the developer, but this is difficult to do with an immediate mode API that gives control to the developer.
PaaS 提供商：提供商至少要控制操作系统、硬件、网络基础架构和资源管理。
PaaS provider: At a minimum, the provider controls operating systems, hardware, network infrastructure, and resource management.
在WebSphere CloudBurst中控制部署的方式是：建立多个不同的云组，从而以物理方式分隔底层硬件资源。
You control deployments in WebSphere CloudBurst by establishing different cloud groups, thereby providing a physical separation of underlying hardware resources.
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