Ключевые слова: accident, attention, background, building, business, caution, clean, cleaner, cleaning, cleanup, copy space, corridor, danger, fall, floor, hazard, housekeeper, housekeeping, hygiene, indoor, information, interior, janitor, job, lobby, maintenance, mop, occupation, office, person, plastic, precaution, prevention, professional, public, risk, safety, service, sign, signal, slip, slippery, symbol, text, warning, wet, working, yellow,