Ключевые слова: abroad, airplane, app, applications, border, certificate, citizen, citizenship, communication, control, coronavirus, digital, documents, education, epidemic, flight, global, government, healthcare, healthy, identification, immigration, immunity, international, journey, medicine, negative, online, pass, passenger, passports, personal, prevention, protection, quarantine, safe, security, smartphone, students, study, technology, ticket, trip, university, vacations, vaccination, virus, visa, visit, women,