| 摘要 |
The front-driven, wheeled framework has a rear frame, at least one rotatably mounted rear wheel on the rear frame, and a forward frame. The forward frame is pivotably attached to a steering frame. A single front wheel is mounted on the steering frame. A limb-operated driving means rotates the front wheel through a transmission means. A steering means steers the propelled front wheel in response to a steering force and independently of the driving means.
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