| 摘要 |
<p>The board has a length measured along a longitudinal direction between two ends (2, 3) of the board, a width measured along a transversal direction (Wo) between two edges (4, 5), and a height measured between a bottom (6) and a top (7), where the circumference of the board has rectilinear portions (51- 53, 61- 63). The rectilinear portions permit to exert pressure of contact with ground at an ideal place, irrespective of the position of feet, and permit to distribute an impulse of force related to sliding of a user.</p> |
