Ключевые слова: activity, backgrounds, big, black, blue, bucket, build, bulldozer, closeup, construction, dig, digger, dozer, earth, equipment, excavate, excavation, excavator, heavy, hoe, hydraulic, industry, iron, isolated, large, loading, machine, machinery, metal, mining, model, mover, orange, part, piston, power, scoop, scraper, shovel, steel, strength, technology, vehicle, white, work, yellow,