However, the penny farthing's popularity lasted only about 20 years, until the advent of the safety bicycle.

不过，随着安全自行车的出现，这种车子只流行了大约20年。

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Mariah Nunes, a sophomore who is a team manager, said she researched an essay on bicycle safety.

校队经理同时也是大二的玛丽亚·纽恩斯说她在研究一篇有关自行车安全的论文。

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In some parts of the world, cyclists have been powering safety lights for years with devices called bicycle dynamos, which use a generator to create alternating current with every turn of the wheels.

在世界的一些地方，骑自行车的人已经通过叫自行车发电机的装置产生了多年的安全电能。当自行车车轮转动的时候一个装在上面的发电机就会产生交流电。

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Cycling did not appeal to the masses until the introduction of the pneumatic safety bicycle with a chain and sprocket drive (the prototype of the modern design).

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British engineer James Starley is, perhaps, most commonly associated with the iconic (and slightly ridiculous) Penny-farthing with its oversized front wheel, but the "safety bicycle, " which his nephew developed the first commercially successful version of in 1885, is the blueprint for most modern bikes.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt

The shock absorbance numbers are impressive, says Randy Swart, director of the Bicycle Helmet Safety Institute in Arlington, Va.

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