To achieve the objects of quality, safety, environment, plan and cost etc, and to improve the experience and project management, it is important to implement the middle estimate on No.

为了实现地铁项目的质量、安全、环境、进度、成本等目标，总结经验，提高地铁项目的管理水平，有必要对地铁五号线项目进行中期评价。

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In order to achieve that there should be a mechanism to transparently inject services into domain objects, no matter where in the code they are instantiated.

为了达成这一目标，需要一种透明的机制将服务注入到领域对象中，不管对象在何处实例化都该如此。

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The number of calls to the objects and the number of lines of code that must be execute to achieve the desired result gives us an idea of the serious processing required to achieve the desired result.

对于这些对象的调用数目，以及为取得期望结果必须执行的代码行数，让我们了解要取得期望结果需要进行多么重大的处理。

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