"They take a sandwich."
Traduzione:Prendono un panino.
In the US, a roll is not a sandwich but a small bread, individually sized, with nothing in it. It is generally served hot. You just add a bit of butter while it is still hot so it can melt.
On the other hand, a sandwich consists of 2 pieces of bread stuffed in the middle with meat, cheese, veggies, condiments, etc. It is often served cold.