Ключевые слова: accident, attention, beware, careful, caution, cleaner, cleaning, cleanup, corridor, danger, equipment, fall, floor, hall, hallway, hazard, hygiene, indoor, information, interior, janitorial, lobby, maintenance, message, modern, notice, office, people, place, plastic, precaution, prevention, public, risk, safety, service, sign, signal, signboard, slide, slip, slippery, standing, surface, symbol, tool, warning, washed, wet, yellow,