| 摘要 |
a single front wheel; a frame supporting a sadle; and right and left rear wheels; rear wheel rotary shafts for connecting the rear wheels and connected to a differential gear of an automatic transmission driving rotary shafts connected to the differential gear and jointed to slip jointed rotary shafts which is connected to fixed rotary shafts fixed to the rear wheels; and an impact buffer fixed to the upper end of the center of a footboard frame having right and left footboards.
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