Ключевые слова: activity, background, blue, building, bulldozer, business, cleaner, cold, construction, development, dig, digger, dirt, earth, equipment, excavate, excavation, excavator, expansion, ground, heavy, high, hydraulic, ice, industrial, industry, land, lift, machine, machinery, metal, power, sand, shovel, site, sky, snow, soil, structure, technology, tractor, transport, vehicle, white, winter, work, yellow,