| 摘要 |
The rectangular shape (1) may be made of expandable material, e.g. rubber or plastics. The corners (2) may be slightly rounded. There is a filling nozzle (3) centrally placed in the side of the rectangular shape facing the inside of the building (5). Air or water may be pumped into the rectangular shaped balloon under pressure. A flat side (4) opposite the nozzle faces the flood on the outside of the building.
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