Ключевые слова: book, boy, caucasian, child, childhood, class, classroom, depression, education, elementary, elementary school, eyeglasses, head shot, indoors, information, knowledge, large, learning, literature, male, primary, pupil, sad, school, schoolboy, schoolchild, schooling, stack, stress, stressed, student, study, studying, table, troubled, unhappiness, upset, white color, whiteboard,