Ключевые слова: after, chair, city, concept, dirty, distancing, empty, face mask, floor, forget, garbage, general, government office, infection, keep distance, left, leftover, littering, lying, marking, mask, medical, neglect, omit, paper, personal, place, pollution, protect, protective, public, risk, rubbish, seat, sign, sitting, social, spreading, symbol, throw away, trash, unclean, untidy, use, used,