Ключевые слова: air, asian, china, citizens, city, defocus, disease, epidemic, face, flu, headache, health, health care, hospital, human, ill, illness, lifestyle, male, man, mask, medical, mouth, outdoor, passenger, people, person, pneumonia, protect, protection, protective mask, public, safety, shanghai, sick, sitting, spread, street, transport, transportation, travel, urban, virus, wear, wearing,