| 摘要 |
A panel comprises a substantially flat body (1) provided at one side with a watertight upper layer (3). A drain (5,9) extends along an edge (7,11) of the panel, and an upper protrusion (13,17) extends along another edge (15,19) of the panel, which upper protrusion protrudes in a plane of the flat body so as to be positioned above a drain of a similar panel adjacent to the panel.
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