Ключевые слова: activity, architecture, background, build, builder, cement, concrete, construction, contractor, dirty, electric, engineering, equipment, exterior, factory, gravel, hands, heavy, house, industrial, industry, job, labor, machinery, manufacturing, material, metal, mill, milling, mix, mixer, mixing, mortar, part, people, professional, rock, safety, sand, site, spark, steel, stone, street, tank, tool, transportation, work, worker,