bed board

例句：

1. 1.The old man sat on the bed board and read a book.
   老人坐在床板上看书。
2. 2.They put their beds on the floor to save space.
   他们把床铺在地板上以节省空间。
3. 3. The new mattress is softer than the old one.
   新的床垫比旧的软。