Ключевые слова: action, backhoe, coal, construction, digger, digging, dirt, dirty, duty, energy, environment, equipment, excavation, excavator, exploitation, fossil, fuel, geology, hard, hat, heavy, industrial, industry, job, labor, machine, machinery, man, mine, miner, mining, moving, nature, people, person, pit, place, production, puddle, quarry, removing, sky, smoke, steam, strip, tractor, under, unloading, work, worker,