Ключевые слова: academic, answering, back, blackboard, board, chalkboard, chemical, chemist, chemistry, class, classmate, classmates, classroom, college, confused, discussing, education, equation, explaining, formula, formulas, green, learning, lecture, lecturer, lesson, man, mentor, mentoring, presenting, professor, puzzled, questioning, school, science, scientific, scientist, secondary, showing, student, study, studying, teacher, teaching, to, training, tutor, tutoring, university, woman,