lǎo / shī / zài / kè / táng / shàng / jiè / shào / le / Kǒng / cóng / zǐ / de / chéng / shū / bèi / jǐng / hé / zhǔ / yào / nèi / róng

老师在课堂上介绍了《孔丛子》的成书背景和主要内容。

The teacher introduced the background and main contents of the Kongzi anthology in class.