Refers to the roommate who sleeps in bed 3 in her room. Roommates can share a room with you, or they can live in different beds in the same apartment or dormitory. So a roommate with three beds is a roommate with three beds in the room. Roommates usually get to know each other by renting a house, allocating dormitories at school or other means. They live in the same space and usually use public facilities such as kitchen, living room and bathroom, so they need mutual respect, understanding and cooperation.