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【专家解说】：1. The rise of modern civilization would have been impossible without the discovery of vast resources of energy and the developments of ways to transform it into useful forms. All that we do requires energy. The more energy we have at our command, the better we can satisfy our desires for food, clothing, shelter, warmth, transport, communication, and manufactured goods. 现代文明的兴起，少不了那些以各种不同方式转换为可被利用形式的广大能源的发明和开发。我们对于能源的需求越大，则愈能够满足我们在食物、服装、住房、取暖、交通以及各种商品的需要。 2. Unfortunately the most convenient fuels – oil and natural gas – are now expensive and their current abundant supply cannot last very long. Alternative fuels all have serious handicaps of one kind or another and nuclear fusion, the ultimate energy source remains a technology of the future. 很遗憾的是，最为方便的燃料---石油和天然气，现在价格昂贵而且眼下充足的供给情况也无法维持太长久了。各式各样的替代能源都有它的缺陷所在，而核能源，这项所谓的极限能源也有待于未来科技的开发。 3. Our earliest ancestors had only food as their energy source and used energy at an average rate of around 90W per person. The mastery of fire and the harnessing of animal power brought this figure to up to perhaps 0.5 kw, where it remains for many people even now. For more than half the people of the world, the energy consumption today is less than 1 kw per person. However, in the United States the average is 11 kw per person and energy production involves one-third of its industrial plants. 我们最古老的祖先们，他们仅能够将食物作为他们的体能来源，而平均每人所使用的体力和精力是大约90瓦的动力。掌握火的使用以及利用动物力量所带给的动力数字也许在500瓦（即，0.5千瓦），甚至，至今为止仍有许多人沿用着这种方式。这世界上有超过一半以上的人类，在当今每人平均的能源消耗是平均每人不到一瓦的动力。然而，在美国却是每人平均要用掉11瓦的能源动力，而且有三分之一是用于工业的工厂。 以上属于个人翻译，请详阅。