Ключевые слова: airplane, border, card, care, certificate, check, concept, control, custom, disease, document, epidemic, face, flight, health, holiday, immigration, immune, immunity, immunization, infection, international, mask, medical, medicals, medicine, negative, pandemic, passport, pneumonia, prevention, protection, quarantine, restriction, safety, security, summer, test, tour, tourism, travel, traveler, vacation, vaccination, vaccine, virus,