With larger stomachs and slower digestion, you don't need as much energy.

有了更大的胃和更慢的消化速度，你就不需要这么多能量了。

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In recent years, a growing body of research has shown that our appetite and food intake are influenced by a large number of other factors besides our biological need for energy.

近年来，越来越多的研究表明，我们的食欲和食物摄入量除了受对能量的生理需求影响外，还受到许多其他因素的影响。

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I felt a need to please people, whatever the cost in time and energy.

我感到一定要使人们满意，耗费多少时间和精力都在所不惜。

《牛津词典》

Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.

VOA: special.2010.01.26

The second piece of information we need to know is what actually the kinetic energy is of the ejected electron, and that's something we can just measure by measuring its velocity.

其次，我们需要知道的信息是,出射电子的动能，这可以通过,测量它们的速度得到。

麻省理工公开课 - 化学原理课程节选

We didn't just need that n, not just the principle quantum number that we needed to discuss the energy, but we also need to talk about l and m, as we did in our clicker question up here.

我们不仅需要ｎ,不仅要这个可以,决定能量的主量子数，还需要ｍ和ｌ,就像我们做这道题这样。

麻省理工公开课 - 化学原理课程节选

China needs to use mainly natural gas to fill its fast growing energy need for cleaner energy.

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It is these cross-cutting concerns--the need for energy, and the need to manage the consequences of energy use--that are creating the energy challenge that will dominate the decades ahead.

FORBES: Magazine Article

Barring a major technology breakthrough, every category of renewable energy will need to grow as rapidly as possible to make a serious dent in the twin challenges of clean energy and climate change.

FORBES: America's Best Places For Alternative Energy