Petroleum will be used up in future, fuel cell will become the major power supplier for transportation in future for its high efficiency and cleanliness.
石油燃料在几十年内逐渐耗尽，而燃料电池以其高效、清洁的特点将会成为未来交通的推动力。
Purity Protection System saves fuel, reduces the level of deterioration, maintains cleanliness in the engine, increases productivity and inter-service interval.
纯度保护系统可以节省燃油、降低恶化水平、保持发动机清洁、提高生产力并延长服务间的间隔。
A measure of the burning cleanliness of jet fuel and kerosine.
喷气燃料和煤油燃烧清净性的一个量度。
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