服务并不为应用而存在；服务提供了延展应用生命力的方法，促进并加快了反映IT系统内在业务意图的能力。
Services don’t exist for applications; services provide a way to extend the life of applications and to foster and accelerate the ability to reflect business intent in IT systems.
即，既可以为组成应用程序的所有程序集打开策略，也可以只为某些程序(而不为其他程序集)集打开策略。
That is, you can turn off the policy for all assemblies that make up the application, or turn it on for some assemblies but not others.
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