Ключевые слова: background, business, button, center, classroom, closeup, college, column, communication, computer, conference, connection, convention, corporate, desk, device, education, employee, empty, equipment, focus, internet, job, keyboard, laptop, lecture, live, meeting, mouse, netbook, notebook, office, pc, presentation, professional, room, row, seminar, space, speak, speech, stage, student, system, teacher, technology, training, university, workplace, workshop,