Ключевые слова: adult, biology, biotechnology, caucasian, chemical, chemist, chemistry, clinic, closeup, coat, dear, development, discovery, doctor, equipment, experiment, face, female, girl, health, hospital, human, infection, lab, laboratory, liquid, mask, medical, medicines, microbiology, one, people, person, portrait, professional, protection, research, science, solution, technician, technology, test, tube, vaccine, white, woman, work, worker, young,