Keywords
absorbed, adolescence, adult, blackboard, board, caucasian ethnicity, cell phone, chalkboard, chalkboards, classroom, college, color image, communication, contemporary, education, facial expression, female, girl, higher learning, horizontal, human, indoors, interior, lean, leaning, learn, learning, mathematics, mood, note, one, one person, people, pixtal, serious, seriousness, sitting, student, study, teenager, telecommunication, telephone, think, thinking, university, 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, cd267055