They are quieter, less polluting, gain efficiency with altitude due to lower ambient temperatures, are more reliable due to fewer parts and the absence of an ignition system, produce much less vibration (airframes last longer) and safer, less explosive fuels may be used. However, the Stirling engine often has low power density compared to the commonly used Otto engine and Brayton cycle gas turbine.
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New electric engines coupled with artificial intelligence and autonomous systems will contribute to a more efficient, integrated transport system that is less polluting and less noisy.
新型电动引擎与人工智能和自主系统相结合，将有助于建立一个更高效、污染更少、噪音更少的综合运输系统。
When people began to realise that there was not enough oil on the earth, they asked car makers to produce more efficient and less polluting cars.
当人们开始意识到地球上没有足够的石油时，他们要求汽车制造商生产能效更高、污染更少的汽车。
Trains are more efficient and less polluting than lorries on all but the shortest routes.
与卡车相比，除了不是最短路线，火车更高效、少污染方面占尽优势。
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