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| 31. | Up to 40 per cent of the chemical energy of the Burning fuel may be changed into mechanical energy." |
| 但是,柴油发动机的效率更高些,因为柴油机具有较高的压缩比一一16比1。高达百分之四十的燃料燃烧产生的化学能转化为机械能。 |
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| 32. | converts the chemical energy of a liquid fuel into mechanical energy by internal combustion; gaseous |
| 通过内燃机把流体的化学能转化为机械能；燃料的气体产品通过涡轮膨胀。 |
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| 33. | generate more electrical power than a fuel cell can because the cell does not profit from the orbital energy |
| 结合缆索和火箭能产生比燃料电池更多的电力，因为燃料电池无法利用本身的轨道能量，而缆索和火箭却能。 |
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| 34. | have the potential for becoming useful energy converters, i. e. to be able to directly convert the energy |
| 磁流体(MHD)发电也有可能成为有用的能量转换器,即将燃料直接转变为电能,但现在的技术工艺,要使其成为可用于电力部门尚需若干年。 |
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| 35. | Benefits such as fuel and energy savings plus lower total emission volumes are realized when air is enriched |
| 使空气变成富氧空气或用高纯度氧替代空气有节约燃料和能量以及更小的总发射体积等好处。 |
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| 36. | would concentrate on using energy more efficiently and on substituting noncarbon renewable or nuclear energy |
| 我们应该致力于将能源做更有效的运用，并以无碳再生能源或核能取代石化燃料（燃煤、石油与天然气，是大气中人造二氧化碳的主要来源）。 |
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| 37. | If you dig deep enough, with luck, you will strike oil or gas, which are used as our main sources of fuel |
| 如果你挖得够深，就可能挖到石油或者天然气。这些东西都是人类的主要燃料和能源。 |
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| 38. | degrees C, have been tested successfully but suffer from significant drawbacks: about one third of the energy |
| 以-253℃贮氢的液态氢系统已测试成功，但却有重大的缺陷：燃料所产生的能量中，约有1/3必须用来维持低温，使氢得以保持液态。 |
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