Ключевые слова: 20s, 30s, apprentices, concentrating, day, dust coat, engineer, engineering, engineeringequipment, factory, fulllength, incidentalpeople, indoors, learning, lookingdown, man, manager, mediumgroupofpeople, men, millennials, multiethnicgroup, operatingequipment, profession, protection, safety, safetyglasses, staff, standing, talking, teaching, trails, training, watching, woman, women, work, workplace, workshop, workstation, youngadults,