According to the washington - based society of automotive engineers , a fuel cell can be two or three times more efficient than an internal combustion engine and it has no moving parts 根据总部位于美国首都华盛顿的汽车工程师协会的研究，一个燃料电池的工作效率相当于一台内燃机的2到3倍，而且其内部没有任何运动机件。
To reduce the traffic accident rate , vehicle engineers , roadway designers , traffic engineers and ergonomic experts all over the world have been looking for the efficient measures 为了减少交通事故，国内外的汽车工程师、道路设计工程师、交通工程师、人机工程师以及交通管理部门的专家和学者均进行了大量的研究和不懈的努力。
Automotive engineers pursued the idea of matching an engine and a battery - powered electric motor to achieve greater horsepower and better fuel economy early in the 20th century but abandoned the concept as engines grew ever more potent and thus needed no boost 20世纪初，汽车工程师曾提出结合引擎和电池动力马达，以提高马力和降低油耗（提高燃料效率）的想法，但后来由于引擎马力越来越大，不需要辅助推进装置，这个概念也弃而不用。
