2004年，电动自行车使用的电池价格下跌，刺激了在欧洲地区的销售。
In 2004, the price of batteries used on ebikes fell, spurring European sales.
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。
Although e-bikes first appeared in the 90s, cheaper options and longer-lasting batteries are breathing new life into the concept.
如今，由于电池质量的提高，电动自行车更好卖了。
Today, thanks to the improvement on the quality (质量) of the batteries, electric bicycles sell much better.
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