Ключевые слова: alert, background, bio, biohazard, biological, biology, button, caution, chemical, clear, concept, contamination, danger, dangerous, design, disaster, disease, environment, environmental, epidemic, garbage, hazard, hazardous, health, icon, industry, isolated, laboratory, medical, medicines, nuclear, poison, pollution, protection, radiation, radioactive, risk, safety, science, security, sign, substance, symbol, toxic, virus, wall, warning, waste, white, yellow,