Ключевые слова: 19, allergy, back, background, book, child, child with book, classroom, clever, coronavirus, cover, covid, covid19, cute, education, elementary, environmental, epidemic, face, ffp3, flu, girl, global, happy, kid, learning, little, mask, medical, n95, n99, pandemic, pollution, portrait, primary, prohibition, protection, protective, pupil, quarantine, respirator, safety, school, schoolgirl, small, smart, student, to, toxic, white,