Ключевые слова: adult, alone, authentic, biology, care, center, chemical, chemist, chemistry, closeup, coat, copyspace, corona, covid, cropped, day, disease, doctor, employee, exam, experiment, health, hospital, indoor, job, lab, liquid, medical, modern, natural, people, person, professional, protect, real, research, safety, science, scientist, staff, technician, test, tube, uniform, virus, work, worker, working, workplace, zoom,