This is the 2574th most frequent Korean word.
보면서
"While looking" or "while watching."
Here, '보면서' indicates a simultaneous action of watching and eating, due to '면서', which connects two concurrent actions.
저는 영화를 보면서 팝콘을 먹었습니다.
I ate popcorn while watching a movie.
In this context, '보면서' connects the acts of looking through (reading) a book and striving to understand, showing simultaneous effort.
책을 보면서 이해하려고 노력했습니다.
I tried to understand while reading the book.
Here, '보면서' links observing a picture and reflecting on one's emotions simultaneously.