目前有几种正在研究中，比如电力引擎、燃气轮机、蒸汽机等。
There are several possibilities being researched at present, such as electric, gas turbine, and "steam" engines.
车轮和螺丝的发明，蒸汽机的问世，电力的使用，所有这些都曾改变了亿万人的生活；
The invention of the wheel and screw, the introduction of steam-power, the use of electricity, all these have changed the lives of millions;
过去的许多繁荣都是基于能量反馈的：煤炭驱动的蒸汽机，石油驱动的内燃机，电力的崛起，甚至喷气时代的大众化旅游。
Many past booms have been energy-fed: coal-fired steam power, oil-fired internal-combustion engines, the rise of electricity, even the mass tourism of the jet era.
大部分电力是蒸汽机提供的。
与蒸汽机车不同的是，电力机车不依赖驱动和点火能力，也不依赖所用燃料的质量。
Thee electric locomotive is not dependent, like its steam counterpart, on the competence of driving and firing or the quality of the fuel burned.
与蒸汽机车不同的是，电力机车不依赖驱动和点火能力，也不依赖所用燃料的质量。
Thee electric locomotive is not dependent, like its steam counterpart, on the competence of driving and firing or the quality of the fuel burned.
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