从理论上讲，氢燃料电池驱动的汽车是无污染的，但由于氢难以廉价、大量地生产，这种汽车在普及方面打了折扣。
Vehicles powered by hydrogen fuel cells are, in theory, pollution-free but their popularity has been compromised by the difficulty of generating hydrogen cheaply and plentifully.
电子软件产业：以嵌入式软件，光电节能，只能系统等高附加值，无污染产品的研发和生产为主。
Electronic software Industry: focusing on developing embedded software, photoelectric energy-saving, intelligent system, featured by high added value and without pollution.
他和萨姆索岛上的居民一同创造了一个可循环，无污染，能够大量生产电量的能源系统。
He and fellow residents on the Danish island of Samso, have created a renewable clean energy system that produces power in abundance.
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