功能是应用的核心，或者它使用的关键的接口。
The functionality is the core of the application, or it exercises key interfaces.
对框架来说，一个实用方法是编写核心功能，将更多结构应用到其中，使其具有可扩展性并简化接口。
A practical approach to a framework is to write the core functionality and then apply more structure to it to make it extensible and simplify the interface.
与只表示核心维的常规一维接口不同，注释可以有多个接口——应用程序中的每一个关注点有一个。
Instead of having conventional one-dimensional interfaces expressing only the core dimension, you get multiple interfaces — one for each concern in the application.
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