system-layer design 制度层设计
In an actual system, the architect would design the classes for each software layer (presentation, business, and data access).
在实际的系统中，架构师会为每个软件层(表示层、业务层和数据访问层)设计类。
To keep this article brief, Figure 7 presents just the static design for the business layer to show how the system-level abstractions are refined to the design.
为了保持本文的简洁， 图 7 只展示了业务层的静态设计，以便说明系统层抽象是如何针对设计进行改进的。
The architect refines the system-level classes to design the business-layer interface.
架构师对系统层类进行改进以设计业务层接口。
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