名詞 coal tar:

1. a tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds

1. 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.
   石腦油一種高度揮發(fā)性的易燃液態(tài)碳氫化合物混合物，從石油、煤焦油和天然氣中提煉出來，并用作石油、溶劑和制造各種化合物中
2. Ammonia, coal tar and coke are all by-products obtained in the manufacture of coal gas.
   氨氣、煤焦油、焦煤都是煤氣生產過程中的副產品。