Keywords
adolescence, adult, blackboard, board, boy, caucasian ethnicity, chalkboard, chalkboards, classroom, color image, contemporary, education, electronics, explain, explanation, forties, gesture, high school, horizontal, human, indoors, interior, learn, learning, male, man, middle-aged, pair, people, pixtal, pupil, student, teach, teacher, teaching, teenager, two, two people, waist-up, young, young adult, youth, 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, cd277003