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, people, pixtal, pupil, student, teach, teacher, teaching, teenager, three, three 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, cd277058