Faeces are food that has been processed by the human digestive system to extract as much useful energy as possible.

人类粪便是已经被人类消化体统为了最大化汲取能量而处理过了的食物。

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One way to release useful energy from plant matter is to ferment it into biofuels, as Synthetic Genomics, LS9 and Amyris are trying to do.

释放植物有用能源的一个方式是将其发酵转化为生物燃料，就如Synthetic Genomics, LS 9 and Amyris他们正在尝试做的。

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Getting useful energy from formate is now the simplest way known for any life form to get its fuel, though it relies on the absence of oxygen.

从甲酸盐中获取所需的能量是目前最简单的维持生命方式，虽然它依赖于无氧的环境。

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So, in this class we'll be talking about energy a lot, and it's often useful to draw some sort of energy diagram to visualize the differences in energy that we're discussing.

所以，这堂课我们会讨论很多,关于能量的问题，讨论时，画能级图来使能量差别,形象化常常是很有用的。

麻省理工公开课 - 化学原理课程节选

Now these quantities were useful because you could relate them. The slope of changes, with respect to volume or temperature of the energy with respect to quantities that you understood, that you could measure.

去得到这些量,这些量很有用，而且你们已经知道了，怎么把它们相互联系起来,像这种比例形式的量，能量比上温度或体,或其它你们懂的可以测量量。

麻省理工公开课 - 热力学与动力学课程节选

Think of nuclear fission: it generates useful energy but if it runs out of control you get a cataclysmic explosion.

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Dr Kanatzidis argues that wherever heat is generated as part of power generation, thermoelectric devices could help extract more useful energy.

ECONOMIST: Thermoelectrics

It is as useful to save energy as it is to save time or Christmas wrapping paper.

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