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Sofa bed has back rest which is mounted on levers, allowing it to be moved to increase or decrease width of seat

机译：沙发床具有靠背，靠背安装在拉杆上，可移动以增加或减少座椅的宽度

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摘要

The sofa bed has a back rest (2) which is mounted on levers (3). This allows it to be moved to increase or decrease the width of the seat (1).

机译：沙发床具有靠背（2），该靠背安装在杠杆（3）上。这使其可以移动以增加或减小座椅（1）的宽度。