This is the 12858th most frequent Korean word.
도서관에서
"At the library."
Here, '도서관에서' specifies the location where the action (studying) took place.
나는 도서관에서 공부했다.
I studied at the library.
In this context, '도서관에서' indicates the place where the ongoing action (searching) is happening.
그녀는 도서관에서 책을 찾고 있다.
She is looking for a book in the library.
For this sentence, '도서관에서' refers to the location where an event (the announcement) occurred.