| 摘要 |
The ski etc. has side edges (1,2) with concave curved sections (3,4,5,6) between the end sections (a,e) and a central section (c). The largest width (Z) of the central section is smaller than the largest width (S,E) of front and rear sections. The areas (b,d) between central and end sections are of the same length and radii. The ski may consist of several parts with side edges fastened to a main body.
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