Ключевые слова: blackboard, board, campus, caucasian, class, classmate, classroom, college, education, equation, female, girl, group, happy, high school, highschool, kid, knowledge, learning, lesson, marker, math, person, problem, pupil, school, science, secondary, solving, standing, student, study, studying, team, teamwork, teen, teenage, teenager, together, university, white board, whiteboard, write, writing,