Ключевые слова: belt, big, black, coal, commodities, commodity, concrete, construction, conveyor, cut, dig, dust, earth, energy, equipment, extraction, factory, fossil, fuel, gold, greenhouse, grey, hole, industrial, industry, large, machine, machinery, manufacturing, material, metal, mine, miner, mineral, mountain, ore, outside, pebble, piece, pile, pouring, power, stack, steel, stone, transportation, transporting, wales, work, works,