Ключевые слова: about, abstract, basics, blackboard, board, business, chalk, chalkboard, class, coaching, college, communication, concept, crash, crisis, depression, display, education, expertise, explain, financial, idea, impression, information, inspiration, instruction, intention, introduction, knowledge, lecture, lesson, meltdown, message, point, research, school, surface, teach, tell, texture, theme, thought, topic, training, understanding, university, wisdom, word, writing, written,