Ключевые слова: abstract, background, blackboard, blur, blurry, business, child, class, classroom, college, color image, company, concept, conservation, desk, development, eco, ecology, economy, education, elementary, energy, environment, environmental, finance, global, governance, indoor, investment, learning, lesson, lifestyle, management, nature, person, pollution, responsibility, room, school, social, strategy, student, study, studying, table, teacher, teaching, technology,