| 摘要 |
A stroller includes a stroller frame, a wheel seat connected fixedly to the stroller frame, a mounting seat disposed under and connected fixedly to the wheel seat so as to define an accommodating chamber between the wheel seat and the mounting seat. A rotatable seat is disposed between two bearings that are disposed within the accommodating chamber, and is connected fixedly to a fork member of a wheel unit so as to permit rotation of the wheel unit about a vertical axis.
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