| 摘要 |
The invention relates to an expandable bladder, and method for making same, having an interior sheet and an exterior sheet extending from a left directi on toward a right direction and where the exterior sheet has an inner side and an outer side. The interior sheet is coupled to the inner side of the exterior sheet where the outer side is facing upwardly and the inner side is facing downwardly. The exterior sheet has at least one fold where, upon being subjected to bending, the at least one fold unfolds to provide additional material so that exterior sheet maintains a distance from the interior sheet .
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