Ключевые слова: alcohol, beaker, biology, black, bottle, burner, chemical, chemistry, contour, danger, dangerous, drop, dropper, equipment, experiment, explosion, fire, flame, flask, glass, glassware, hazard, icon, illustration, isolated, lab, laboratory, line, linear, liquid, medical, medicine, nuclear, outline, radiation, radioactive, research, science, scientific, set, silver, skull, stand, symbol, test, toxic, tube,