00553naa#a2200169#i#450# EN\INFRA-M\bibl\42647 20240812141550.1 2587-9103 20210623b2021####ek#y0engy0150####ca RU Challenges of Online Education in a Lockdown Environment Journal article Moscow INFRA-M Academic Publishing LLC. 2021 4 с. Journal article local Лингвистика. Языкознание. Языки. 81 Kalugina Tat'yana Nikolaevna naukaru.ru