Ключевые слова: big, coal, control, digger, digging, dirt, dirty, energy, engineering, environment, equipment, excavating, excavation, excavator, fossil, fuel, geology, hard, hardhat, hat, heavy, industrial, industry, job, jobs, loader, machine, machinery, man, mine, miner, mining, nature, outdoor, people, person, place, production, puddle, quarry, sandpit, sky, smoke, soil, steam, under, unloading, wheel, work, worker,