Ключевые слова: activity, building, completion, concrete, conditions, construction, digging, dirt, dust, earth, engineering, environment, environmental, equipment, excavation, force, gravel, heavy, helmets, industry, laboratory, landscape, loader, machinery, maintenance, management, manual, movement, moving, operating, operator, operators, outdoors, progress, safety, site, skills, street, sunset, surgery, task, teamwork, terrain, vehicles, weather, work, workers, working,