燃素，热素原来假设的在所有燃烧物质中挥发性的一种物质成分，在燃烧中作为火焰而被释放出来 A hypothetical substance formerly thought to be a volatile constituent of all combustible substances released as flame in combustion.
石脑油一种高度挥发性的易燃液态碳氢化合物混合物，从石油、煤焦油和天然气中提炼出来，并用作石油、溶剂和制造各种化合物中 Any of several highly volatile, flammable liquid mixtures of hydrocarbons distilled from petroleum, coal tar, and natural gas and used as fuel, as solvents, and in making various chemicals.
石油类是石油当中易挥发，易点燃的成分。通过蒸馏获得，用作溶剂 A volatile, flammable fraction of petroleum, obtained by distillation and used as a solvent.
