| 摘要 |
A wheel structure includes a main wheel body, a pair of extension sections extending from respective sides of the main wheel body, and a pair of auxiliary sections coaxially extending from the extension sections, respectively. The main wheel body of the wheel has a larger outer diameter than the outer diameters of the auxiliary sections. Both the main wheel body and the auxiliary sections are provided with outer tires made in a different material. The wheel increases contact surfaces with the ground when making turns, so as to prevent overturning.
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