Ключевые слова: activity, architecture, background, big, blue, building, business, center, city, commercial, concrete, construction, contractor, crane, cranes, day, design, development, engineering, equipment, estate, factory, girder, growth, hazardous, high, industrial, industry, large, lift, machinery, major, modern, occupation, outdoor, people, progress, project, scaffold, scaffolding, site, sky, steel, structure, tall, technology, tower, transport, urban, work,