| 摘要 |
A rollerboard has a platform and a plurality of rollers. The rollers are disposed below the platform and extend transversely of the platform. The rollers are arranged one behind the other along the length of the platform and have lengths which progressively decrease from each end of the platform toward the centre of the platform. When the rider leans towards one side, the edge of the rollers provide a rough arc through which a turn is effected.
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