| 摘要 |
The sports field (1) has vertical tubular elements (4,5,7,9,10,13,15,22), with different lengths, fixed to its surface. Other tubes (11,12,14) are mounted between the vertical elements and the ground and are at an angle to it. The players move between the tubular elements so that they are hidden from opposing players. Some of the tubular elements (16') have an internal diameter which is large enough for a player to crawl inside. The distribution of the tubular elements is symmetrical to a median line (8) marked on the field.
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