系统使用五层体系结构，分别为：用户交互层，系统编程接口层，挖掘核心服务层，数据库访问层，数据库。
The system structure is a multilayer system structure with five layers. They are user interactive layer, system program interface layer, mining core service layer, data access layer, database layer.
正如在前面的几个部分中所述，基础结构和运行时层提供了用于运行sca应用程序的核心服务。
As described in the previous sections, the Infrastructure and the Runtime layer provide core services for running SCA applications.
核心OS、核心服务、多媒体层以及Cocoa。
The core OS, core services, media layer, and Cocoa — to build the iPhone OS we took the bottom three layers to form the iPhone OS.
核心OS、核心服务、多媒体层以及Cocoa。
The core OS, core services, media layer, and Cocoa — to build the iPhone OS we took the bottom three layers to form the iPhone OS.
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