| 摘要 |
Device including flexible main sheet, two fold regions, and two flexible flap sheets. Main sheet has first and second opposite sides and edge surrounding sides. Fold regions are located along two spaced-apart portions of edge. Each flap sheet has first and second opposite sides. Flap sheets are integrated with main sheet at fold regions. Flap sheets are configured for being bent toward first side of main sheet. Main sheet is configured for being bent to move fold regions toward each other, while retaining bias for moving fold regions away from each other. Apparatus including trough and device. Trough includes base member integrated with two spaced-apart wall members forming side walls in trough. One side of each flap sheet in contact with a side wall. Main sheet is bent with fold regions at least partially positioned toward each other, and configured for retaining bias for moving fold regions away from each other. Methods also provided.
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