Ключевые слова: abstract, alarm, alert, background, black, concept, crisis, culmination, curve, danger, distress, earthquake, flood, forecast, frame, frequency, graphic, hazard, lab, laboratory, line, magnitude, marking, medical, medicine, menace, observation, oscillations, oscilloscope, outlook, paper, peak, pen, placard, poster, research, risk, science, scientific, sign, study, symbol, threat, tsunami, wallpaper, warning, watch, wave,