This posed a conundrum for researchers working with the laser: How were they to apply the laws of conservation of charge and conservation of energy with two forms of energy output?

这就为研究激光的工作人员出了一个难题：如果能量输出有两种形式，他们怎样运用电荷守恒和能量守恒定律呢？

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Energy Star has a 20-year history educating the public about energy conservation and efficiency.

“能源之星”过去20年来向公众介绍了有关节约能源和能源效益的知识。

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This was part of a broader energy plan meant to boost conservation, improve energy security and move toward reliance on renewable sources of electricity.

这是旨在推动环保，促进能源安全和转向依赖可再生电力能源的更广泛能源计划中的一部分。

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Each year the Washington-based League of Conservation Voters releases a scorecard that rates the performance of members of Congress on environment and energy issues.

VOA: standard.2010.02.25

All right, now what we're going to learn next time and Bob Field is going to teach the lecture next time, is how heat and work are related, and how they're really the same thing, and how they're related through the first law, through energy conservation.

这节课就到这里,下节课将由Bob，Field讲授,我们将学习功与热量的关系，认识到它们在本质上的相同之处，并通过热力学第一定律，亦即能量守恒定律，把它们联系起来。

麻省理工公开课 - 热力学与动力学课程节选

What about all those bureaucrats at the Department of Energy working on renewable energy and energy conservation?

FORBES: Tax My Carbon

Although, with plentiful oil and natural gas in the US, the pressure on energy conservation has eased a bit it is clear that there is a finite amount of accessible energy available and conservation of energy is important to preserve these assets for future generations.

FORBES: Pumping Iron and Keeping Cool

Greater energy efficiency comes from more highly developed technology and better energy management and conservation practices.

FORBES: China's Energy-Efficiency Mandate