1 sentence

1. 俞教授是我大学时的老师，学识非常渊博。

   Yú jiào​shòu shì wǒ dà​xué shí de lǎo​shī, xué​shí fēi​cháng yuān​bó.

   Professor Yu was my teacher in college; he is very knowledgeable.

   Source: Dong Chinese Dictionary