What prevented Chris Cocalis from developing e-bikes sooner?

是什么阻碍了克里斯·科卡利斯更迅速地开发电动自行车？

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Although e-bikes first appeared in the 90s, cheaper options and longer-lasting batteries are breathing new life into the concept.

虽然电动自行车最早出现在上世纪90年代，但更便宜的选择和更持久的电池正在给这一概念注入新的活力。

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E-bikes weren't always so popular on the mainland.

电动自行车并不是一直在大陆畅销的。

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Hertz's e-bikes come in two slick-looking models, powered by lithium ion batteries and nearly silent motors.

BBC: Rent an electric bike in London

On 6 June, Hertz became the first major rental car company to offer e-bikes, stocking a dozen at its Marble Arch location.

BBC: Rent an electric bike in London

Barclays has made about 5, 000 traditional bicycles available at hundreds of docking stations throughout the city, which makes it a more convenient option than Hertz's mere dozen e-bikes at a single location.

BBC: Rent an electric bike in London