Ключевые слова: american, background, building, contagious, coronavirus, corridor, covid19, direction, disease, down, education, epidemic, exit, hallway, hazardous, health, high, illness, in school, information, interior, learning, one way, only, pandemic, preventive, protection, return, return to school, safety, school, sign, six feet apart, social distancing, spreading, staircase, stairs, students, symbol, teachers, up, virus,