Ключевые слова: city, colleagues, commuter, couple, daily, device, disease, diverse, epidemic, flu, health, internet, lifestyle, looking, male, mask, messaging, metro, mobile, modern, pandemic, passenger, people, phone, protection, quarantine, relationship, rule, safety, selfies, smart, smartphone, social, standing, student, subway, technology, texting, together, tourist, train, transport, transportation, travel, underground, urban, virus, wearing, woman,