| 摘要 |
A slide body with a top end and a bottom end including a bed portion an d sidewalls disposed beside the bed portion respectively on opposite sides thereof. Each sidewall includes an upper portion extending from the top end toward t he bottom end, and a lower portion extending from the bottom end toward the top end. The bed portion has a profile substantially defining a path taken by th e user sliding from the top end to the bottom end. The upper portion of each sidewa ll extends above the profile at least a first predetermined distance along a selected length of the upper portion, and the lower portion of each sidewall extends above the profile at least a second predetermined distance along a selected length of the lower portion. The first predetermined distance exceeds the second predetermined distance by a ratio of at least about 2:1.
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