Ключевые слова: air, allergy, boy, care, child, danger, disease, dust, environment, environmental, face, family, flu, gas, girl, happy, health, healthy, hospital, illness, infection, influenza, kid, little, mask, medical, medicine, mouth, person, pollution, portrait, prevention, protect, protection, protective, safety, school, sick, smile, smog, smoke, toxic, virus, wearing, woman,