trundle bed
noun /ˈtrʌndl bed/
  /ˈtrʌndl bed/
(North American English)- a low bed that can be stored under a higher bed组合床:可在较高床下存放的低床 - A trundle bed is a great solution for occasional guests.对于偶尔来访的客人来说,折叠床是一个很好的解决方案。 
 
- A trundle bed is a great solution for occasional guests.