Ключевые слова: accident, airport, attention, beware, building, cantonese, careful, caution, clean, danger, fall, floor, foot, hazard, hazardous, hurt, indoors, information, injury, interior, irony, janitor, joke, liability, lobby, maintenance, man, mistake, mopping, notice, plastic, precaution, prevent, prevention, progress, public, reflection, risk, safety, sign, signal, skid, slip, symbol, tiles, warning, wet, yellow,