Ключевые слова: activity, apartment, architecture, backhoe, blue, building, buildings, business industry, challenge, city, colored, concrete, construction, construction site, contractor, corporate, crane, development, engineering, environmental issues, equipment, factory, frame, future, global, gray, ground, growth, heavy, high, industrial, industry, iron, job, laborer, machine, machinery, mixer, occupation, operator, road, sand, site, sky, soil, structure, work, worker, yellow,