求翻译：第二部分讲述了开发节能控制器的总体方案，从工作要求、主要原理和总体结构几方面概括性地介绍节能控制器的开发。是什么意思？

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Part 2 describes the development of energy-efficient control of the overall program, from the requirements, the main principles and overall structure overview of several energy-saving control on the development server.

The second part narrated the development to conserve energy the controller the overall concept, from the work requirement, the main principle and the overall structure several aspect concisely introductions conserved energy the controller the development.

Part II describes the development of energy-saving controller for overall programme, job requirements, main principles and overall structure of several broad introduction of the development of energy-saving controller.

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