由于60纳米的扭矩，这种自行车比典型的安装了电动旋翼叶毂发动机的自行车有更多动力。

With 60Nm of torque, the bike has a lot more grunt than a typical electric hub-motor installed in bicycles.

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叶世安(音)说道。他62岁，体格匀称，理着平头，每天都要骑20分钟自行车——并非健身，这是他来公园晨练的交通工具。

That's strange, "said Ye Shi an, 62, a fit man with a crew cut who rides his bike 20 minutes every day - not as for exercise, but as transportation to the park to exercise."

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二十世纪后半叶，当机动车被作为北美城市的主导交通工具，自行车、行人和骑马者寻求远离噪音和尾气的途径。

In the second half of the twentieth century, as the automobile assumed almost total domination of North American cities, bicycles, pedestrians and equestrians sought escape from the noise and fumes.

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