Ключевые слова: adult, african ethnicity, blackboard, boys, businessman, casual clothing, caucasian ethnicity, classroom, creativity, desk, discussion, education, epidemic, expertise, group of people, indoors, learning, lifestyles, looking, occupation, pandemic, professional occupation, professor, protective mask, school building, science, sitting, smiling, standing, student, studying, success, table, talking, teacher, teaching, teamwork, women, working, young adult,