Ключевые слова: activity, background, builder, built, cap, concrete, construct, construction, dangerous, development, form, group, hammer, hard, hat, helmet, high, industrial, industry, job, labor, laborer, labourer, male, manual, measure, men, metal, occupation, people, person, profession, roof, safe, safety, scaffold, scaffolding, site, sky, staff, structure, sun, team, under, work, worker,