本实用新型设计合理，两侧轮可始终保持同时着地。
The utility model has the advantages of reasonable design and two side-wheels can be kept to land on grounds simultaneously.
四个驱动电机的同侧轮 之间实行并联，两侧轮之间实行串联；
The wheels at the same side of the four driving motors are connected in parallel, while the wheels at two sides are connected in series;
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