前轮大后轮小的自行车 penny farthing
小轮后端前轴承 Pinion head bearing
小轮后端后轴承 Pinion rear bearing
后勤小轮 logistic launch
现代自行车的原型称作penny-farthing（一种前轮大后轮小的自行车）。
The ancestor of the modern bicycle was called a penny-farthing.
后轮旋转起来，小货车冲过了最后几英尺。
The back wheels spun and the van spurted up the last few feet.
山图也发了联合飞轮加上后轮，称为股枢纽于1969年，小轮自行车。
SunTour also made a combined freewheel plus rear hub, called Unit-Hub, in 1969 for small wheel bicycles.
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