lì shǐ kè shàng / lǎo shī / jiǎng dào / le / Sū é / chéng lì / chū qī / de / shè huì biàn gé

历史课上，老师讲到了苏俄成立初期的社会变革。

In history class, the teacher discussed the social changes during the early years of Soviet Russia.