Ключевые слова: 40s, adult, african, alone, analysis, biology, candid, chemical, chemistry, coat, content, diabetes, disease, dish, doctor, employee, equipment, ethnic, experiment, expert, eyewear, glass, goggles, handsome, happy, holding, inside, job, lab, looking, male, man, mature, measure, people, person, positive, professional, research, safety, science, smiling, staff, test, uniform, urine, vitality, worker, working, workplace,