Ключевые слова: accident, alarm, alert, alertness, background, bell, box, break, building, business, button, call, concrete, control, danger, emergency, equipment, evacuation, fire, hand, handle, hazard, help, hospital, house, illustration, industrial, installation, office, panel, protect, protection, pull, push, red, safe, safety, school, secure, security, services, sign, switch, symbol, system, trouble, wall, warning, water, white,