Lì shǐ / kè shàng / lǎo shī / jiè shào le / Cáo Kūn / zài / Běi yáng / zhèng fǔ / shí qī / de / zhèng zhì / huó dòng

历史课上，老师介绍了曹锟在北洋政府时期的政治活动。

In history class, the teacher introduced Cao Kun's political activities during the Beiyang government period.