第十一章在系统级别讨论了简洁代码，如依赖注入和面向方面编程技术。

Chapter 11 talks about clean code in the context of system-level techniques such as Dependency Injection and Aspect-Oriented Programming.

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熟悉面向方面编程（或 AOP）的人们会把它认为是横切关注点，这意味着防御性编程技术横跨了代码库。

Those familiar with aspect oriented programming, or AOP, will recognize this as a crosscutting concern, meaning that defensive programming techniques span horizontally across a code base.

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EJB 3.0还增加了在您的应用程序中使用面向方面的编程技术这一能力。

EJB 3.0 also adds the ability to use Aspect Oriented Programming techniques in your application.

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