作为应用程序和扩展的构建单元。
重用：数据服务可作为操作企业数据的可重用构建单元。
Reuse: data services serve as reusable building blocks of operations on enterprise data.
SOA是面向服务的体系构架，以企业的业务作为系统的构建单元。
SOA is service-oriented system architecture to the business enterprise system for the construction of units.
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