The new possibility of Dependency Injection for domain objects.

对于领域对象的依赖注入的新可能性。

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This time, however, the failure isn't due to the lack of metaprogramming on a domain class. It's due to the lack of dependency injection.

但是，这次失败并不是因为域类上缺少元编程，而是因为缺少依赖性注入。

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Step 2: Rich Domain Objects with on-demand dependency injection.

第二步：按需进行依赖注入的富领域对象。

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Step 2: Rich Domain Objects with on-demand dependency injection.

第二步：按需进行依赖注入的富领域对象。

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