tā / zài / dà xué / lǐ / zhuān gōng / mù lù xué / yán jiū / gǔ jí / de / bǎn běn / yǔ / yuán liú

他在大学里专攻目录学，研究古籍的版本与源流。

He specialized in bibliography at university, studying the editions and origins of ancient books.