通过应用依赖倒置，模块能够用修改依赖模块的方式简单的被其他模块修改。
By applying the dependency Inversion the modules can be easily changed by other modules just changing the dependency module.
图6显示了将JarProject作为每个模块的依赖项添加之后，mybinary . jar被自动复制到每个模块的备份EAR项目中。
Figure 6 shows the automatic copying of mybinary.jar to each module's backing EAR project after JarProject is added as a dependent of each module.
高层不应该依赖底层模块，两者应该抽象(无法被实例话的接口，类啥的)；抽象不应该依赖细节；细节应该反而依赖抽象，换句话说也就是面向接口编程。
High level modules should not depend upon low level modules. Both should depend upon abstractions. Abstractions should not depend upon details. Details should depend upon abstractions.
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