即使在那些看似有必要建设新工程的地区，我们也必须找到以较少的资源满足需求的方法，同时尊重生态准则，并使预算费用更少。
Even in regions where new projects seem warranted, we must find ways to meet demands with fewer resources, respecting ecological criteria and to a smaller budget.
在此层级的每一级上，我们将使用功能分析来派生需求，并用工程方法来得出有效性度量。
At every level of the hierarchy, we would use functional analysis to derive requirements and engineering methods to derive measures of effectiveness.
数据模型可以采取自上而下的方法根据业务需求单独开发，也可以采取自下而上的方法通过对已有数据结构进行反向工程来开发。
The data model may be developed top-down solely based on business requirements or bottom-up through reverse engineering of existing data structures.
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