石油主要被用来作为燃油和汽油，燃料油和汽油组成世界上最重要的一次能源之一。
Oil is primarily used as fuel oil and gasoline, which make up one of the world's most important primary energy.
基于气体燃料(一般是氢气)氧化产生电流的一种一次能源发生设备。
A primary power-generating device based on the production of an electric current by the oxidation of a gaseous fuel, usually hydrogen.
天然气是一种优质的环保型能源和燃料，它在世界一次能源结构中的比例逐年上升。
Natural gas is a high-quality and environment-friendly energy source and fuel, and its percent in primary energy constituent in the world is more and more increasingly.
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