Ключевые слова: air, attack, border, business, city, close, closed, closure, concept, contagion, containment, coronavirus, covid, crisis, danger, dangerous, defend, difficult, difficulty, disaster, disease, drug, economy, financial, human, humanity, illness, infection, invisible, isolation, lockdown, pandemic, population, protect, protection, quarantine, resist, risk, safe, safety, sars, skyscraper, solution, stop, threat, town, vaccine, viral, virus, world,