Ключевые слова: air, bacteria, blue, care, caution, city, clinic, cold, epidemic, face, flu, guy, health, hygienic, isolated, male, man, mask, medical, medicine, men, outside, people, person, pollution, portrait, prevention, protection, protective, quarantine, respirator, respiratory, safety, school, sick, stop, street, student, tourist, travel, virus, wear, young,