Ключевые слова: alarm, alert, attention, bell, bellringer, bronze, call, caution, childhood, chime, clanging, class, classic, college, ding, dong, education, first, gong, graduation, handbell, icon, illustration, information, instrument, jingle, knowledge, last, learning, lesson, melody, metal, metallic, pupil, research, ribbon, ringer, school, schooling, science, september, sign, signal, simple, sound, student, study, symbol,