| 摘要 |
With a vehicle comprising a motor (5; 12; 20, 21; 32, 33) and two rotatable elements (1, 2; 18, 19; 30, 31) which are in contact with the ground during travelling of the vehicle, the vehicle has two substantially parallel, once passed through contact tracks with the ground and each of the two rotatable elements (1, 2; 18, 19; 30, 31) is capable of being driven. Consequently, th e vehicle is compact and has a simple steering mechanism.
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