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.
现代自行车在许多方面不同于早期的自行车。
Modern bicycles differ from the early ones in many major ways.
使用滚珠轴承及链条设计出了前、后车轮大小一样的现代自行车。
Starley of England devised the more modern bike with a chain and gearing to allow the wheels to be of equal size.
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