| 摘要 |
The balance of a bicycle is obtained by having two front wheels instead of one. The two front wheels are set apart but are connected by the same controller arm at the shoulders. The controller arm is a tube 1 inch in diameter and 18 inches long. The controller arm is attached at the middle to the bottom of the steerer tube and at the top of the steerer tube are attached the left and right handles. At both ends of the controller arm are the shoulders of the two pairs of forks for the two wheels. As is usual, the two front wheels are turned by using the handle bars.
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