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.
氨气、煤焦油、焦煤都是煤气生产过程中的副产品。 Ammonia, coal tar and coke are all by-products obtained in the manufacture of coal gas.
