Ключевые слова: background, balance, blackboard, board, business, career, chalk, chalkboard, choice, choose, comparison, concept, conference, design, display, education, employment, family, freehand, handwritten, happiness, harmony, home, idea, job, leadership, life, lifestyle, live, occupation, opportunity, planning, portable, presentation, projection, projector, quality, relation, screen, seesaw, select, seminar, sign, slide, stress, success, symbol, thinking, tripod, weight, wide, work,