<https://bst.ir/lessons/%d8%ac%d9%84%d8%b3%d9%87-1-31/#webpage>
<http://schema.org/dateModified>
"2021-05-12T07:40:55+00:00"^^<http://schema.org/Date>
<https://bst.ir/lessons/%D8%AC%D9%84%D8%B3%D9%87-1-31/>