Ключевые слова: aspiration, background, billboard, blackboard, blank, board, browser, business, chalk, chalkboard, classroom, collection, concept, design, education, empty, field, find, green, help, idea, imagination, information, innovation, knowledge, label, learn, meeting, mind, notion, performance, plan, problem, process, progress, research, school, schoolroom, sign, solution, strategy, study, success, symbol, teaching, teamwork, think, tool, white, wisdom,