| 摘要 |
The sofa-bed has a hinged, cushioned seat platform which provides a soft support for the seat cushions when the sofa-bed is used as a sofa, and which swings to an upright position to form a headboard for the bed when it is unfolded. The hinge structure permits the pivot point of the platform to rise and fall when people get up from or sit down on the sofa cushions.
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