Ключевые слова: 1 person, 3540 years, accuracy, africanamericans, balance, builder, built structure, casual clothing, concentration, construction, construction frame, construction worker, crouching, expertise, exterior, frame, framework, front view, full length, hard hat, holding, level, measuring, midadult man, occupations and work, outdoors, precision, safety, skilled worker, spirit level, surveyor, timber, wooden, working,