应用程序实现所需的业务功能。
The application program implements the desired business function.
换言之，就是不需要为某些只有单个应用程序才使用的业务功能创建服务。
In other words, you do not need to create a service from some business function that was used by only one application.
因此，中间件层更注重考虑应用程序的核心业务功能。
Therefore, the middleware layer enhances the focus on the core business function of the application.
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