They argue that small exercise bikes could be a cheap solution.

他们认为小小的健身自行车或许是一种成本低廉的解决之道。

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Most e-bikes rely on lead-acid batteries, cheap century-old technology unsuitable for the growing demands of daily commuting.

大多数电动自行车依靠酸性电池，这种非常廉价的上世纪的技术已经不能满足于每天消耗量的上升。

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At one time, every town in the country had at least one frame builder, but the craft largely disappeared over the past couple of decades as cheap, mass produced bikes were imported from Asia.

BBC: How to build a bike: The revival of a British craft