Ключевые слова: a person, a single child, air pollution, biohazard symbol, boy, city, cold and flu, contagious disease, coronavirus, covid19, danger, disease, disease prevention, environmental pollution, epidemic, european, fever, fresh air, healthcare and medicine, human face, hygiene, just kids, male, pandemic, persons, portrait, prevention, protection, protective mask, quarantine, security, virus, watch out,