Keywords
above 18, blackboard, caucasian, college, color image, communication, concentration, education, giving, horizontal, indoors, learning, lectern, lecture, lecture hall, listening, medium group of people, professor, rear view, row, sitting, standing, student, university, young adult, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, 091011