Ключевые слова: back, blackboard, board, boss, brainstorming, business, businessman, chalkboard, class, classroom, coach, coaching, conference, consultant, course, demonstrating, discussing, education, educational, employee, explaining, green, learning, lecture, lecturer, lesson, male, man, manager, meeting, office, old, personal, pointing, presentation, presenting, professional, school, seminar, showing, student, study, studying, teacher, teaching, trainee, trainer, training, young,