Ключевые слова: alert, art, atom, atomic, background, caution, chemical, chemistry, color, colorful, contaminate, contour, danger, dangerous, disaster, energy, fission, hand, hazard, hazardous, icon, illustration, industry, isolated, line, linear, lineart, nuclear, outline, plutonium, poison, pollution, power, radiation, radioactive, radioactivity, ray, reactor, risk, safety, science, set, sign, substance, symbol, toxic, uranium, warning,