Miniature fuel cells can last a helluva long time (30 days without recharging on a phone) but no one has quite figured out how to effectively build 'em.
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大坪说，试想一下，某一天你能为家庭或办公室购买一个包括松下的燃料电池和三洋的太阳能电池板的套装。
Imagine the day when you could buy a package of Panasonic's fuel cells and Sanyo's solar panels for the home or office, Ohtsubo said.
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