Ключевые слова: belt, belting, blue, bridge, brown, burn, business, coal, commodity, concrete, construction, conveyor, crushing, dig, dirty, energy, engineering, extraction, factory, falling, geology, global warming, gravel, heavy, industrial, industry, large, long, machine, machinery, manganese, material, metal, mine, natural, ore, outdoor, pollution industry, power, quarry, raw materials, rock, site, stone, technology, texture, transport, transportation, vehicle, work,