This is the 3729th most frequent Turkish word.
yerlerinden
"From their places"
In this sentence, "yerlerinden" refers to the places where the children were situated or sitting.
Bazı çocuklar oyun oynarken yerlerinden kalkıp koşmaya başladılar.
Some children started running up from their places while playing.
Here, "yerlerinden" indicates the spots or positions where the books were located.
Kitaplarını yerlerinden alıp rafta düzenledim.
I took their books from their places and arranged them on the shelf.
In this example, "yerlerinden" is used metaphorically to describe the origin or source of the sounds.