1 sentence

1. 这位图书管理员对馆内的藏书非常了解。

   zhè wèi tú​shū guǎn​lǐ​yuán duì guǎn nèi de cáng​shū fēi​cháng liǎo​jiě.

   This librarian is very familiar with the library's collection.

   Source: Dong Chinese Dictionary