Ключевые слова: a plus, academic, blue, book, bookshelf, campus, caucasian, chalkboard, cheerful, college, college student, desk, digital tablet, education, equation, female, formula, geometry, girl, happy, higher education, knowledge, library, math, portrait, result, revising, school, scrolling, sitting, smiling, student, studying, tablet, tablet computer, tablet pc, teenager, test, textbook, touching, touchscreen, triangle, university, university student, using,