Ключевые слова: accident, advice, attention, bathroom, beware, building, caution, clean, cleaner, corridor, danger, fall, floor, guide, hall, hazard, hotel, icon, indoors, industrial, information, interior, janitor, lobby, maintenance, message, nobody, notice, object, precaution, prevention, public, restroom, risk, room, safety, service, sign, signal, signboard, slip, slippery, staircase, symbol, tool, warning, wet, work, yellow,