Ключевые слова: air, allergy, back to school, background, backpack, care, coronavirus, covid19, dangerous, disease, education, epidemic, face, fence, fencing, filter, flu, girl, health, health care, infection, infectious, knapsack, lattice, learning, man, mask, medical, medical mask, medicine, outbreak, people, pollution, portrait, prevention, protection, protective, quarantine, red folder, respirator, respiratory, safety, school, schoolgirl, sick, student, virus, wearing, woman, young,