This is the 12th most frequent Portuguese word.
dos
"Dos" in Portuguese means "of the" or "from the" (masculine plural).
Here, 'dos' is a contraction of 'de' + 'os', meaning 'of the'. It shows possession or association, indicating that the books belong to the students.
Os livros dos estudantes estão na mesa.
The students' books are on the table.
In this sentence, 'dos' again is a contraction of 'de' + 'os' and relates 'sabor' (taste) to 'morangos frescos' (fresh strawberries), specifying origin or characteristic.
Gosto do sabor dos morangos frescos.
I like the taste of fresh strawberries.
Here, 'dos' as 'de' + 'os' indicates one individual out of a group, emphasizing selection or partitive meaning within the context of the set of friends.