1 a bed that is fixed to a wall, for example on a ship or train （船、火车等依壁而设的）床铺，卧铺

2 (also bunk bed) one of a pair of single beds built as a unit with one above the other 双层单人床；上下铺 ☞Look at the note and picture at bed. 参看 bed 的注释及插图。