Ключевые слова: accident, alert, area, attention, background, beware, board, building, careful, caution, clean, cleaner, cleaning, cleanup, danger, emblem, equipment, fall, floor, hazard, hygiene, information, interior, janitorial, maintenance, mop, no entry, notice, object, office, plastic, precaution, prevention, process, progress, red, risk, safety, service, sign, signal, slip, slippery, sticker, symbol, warning, wet, work, worker, yellow,