Ключевые слова: 3d, alarm, background, business, class, classroom, clock, communicate, communication, concept, conceptual, direct, direction, educate, education, encourage, encouragement, icon, inspiration, inspirational, inspire, instruct, instruction, instructor, learn, lesson, motivate, motivation, motivational, old, school, schooling, session, sign, students, symbol, teach, text, time, train, white, word,