Defining this model is the necessary intermediary step between the concept stage and implementation stage.

对模型进行定义是概念阶段和实现阶段之间的必要中间步骤。

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A National energy Administration official said the concept of "new-energy model cities" is still in the early stage of development.

国家能源管理部门官员表示，“新能源示范城”这个概念还处于前期酝酿中。

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National Energy Administration official said the concept of "new-energy model cities" is still in the early stage of development.

国家能源治理部分官员表示，“新能源示范城”这个概念还处于前期酝酿中。

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