Lǎo / shī / zài / kè / shàng / jiè / shào / le / Mǔ / dān / Tíng / de / zuò / zhě / Tāng / Xiǎn / zǔ老师在课上介绍了《牡丹亭》的作者汤显祖。The teacher introduced the author of The Peony Pavilion in class.