This is the 5146th most frequent Russian word.
наслаждаются
"Enjoy" or "take pleasure in."
The word 'наслаждаются' here is used to indicate that the subject ('они' - 'they') is actively experiencing pleasure from tranquility.
Они наслаждаются спокойствием, которое приносит природа.
They enjoy the tranquility brought by nature.
In this sentence, 'наслаждаются' is used to describe the action of children experiencing pleasure from the taste.
Дети наслаждаются вкусом свежих фруктов.
Children enjoy the taste of fresh fruits.
Here, 'наслаждается' is used to express an individual taking delight in the aesthetic experience of the sunset.