| 摘要 |
<p>A mattress comprising an upper mattress (5), which provides a reclining surface for a person, and a lower mattress (1) , wherein one or more recesses (4) are present in at least one of the upper mattress and the lower mattress, which one or more recesses (4) are located near the boundary surface between the upper mattress (5) and the lower mattress (1).</p> |
