| 摘要 |
The mat (1) has a set of bottom and upper foam layers (3, 5) formed with a set of top regions (3a, 3b) and a set of bottom regions (5a, 5b), where each foam layer has thickness of 2 centimeters. The foam layer (3) is glued to the region (3a) at the bottom region (5b) of the foam layer (5). A pool cover (7) is present on the top region (5a) of the foam layer (5) and over a surface of the top region (5b) of the foam layer (3). A set of bearing parts is equipped with a set of recesses, protrusions and puzzle pieces. |
