Ключевые слова: belt, big, black, brown, bucket, car, coal, construction, conveyor, digging, earth, energy, engine, environment, excavation, excavator, fossil, gas, geology, ground, industrial, industry, iron, landscape, large, lignite, load, machine, mine, mountain, natural, oil, open, ore, over, pattern, pit, plant, pollution, power, powershovel, shovel, steel, strip, transport, transportation, trench, truck, wheel, work,