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tar production
tech.	焦油生产
tar production The manufacture of dark, heavy, viscous substances or residue, which is obtained by the distillation of organic materials such as coal, wood and petroleum
environ.	焦油生产 (深色的、重、粘性物质或残渣的制造，从有机材料如煤炭，木材和石油的蒸馏中获得。)