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对中国这样一个自行车大国来说,这个神奇的轮子也许蕴藏着巨大商机。在哥本哈根气候大会其间,麻省理工学院的研究者初次展示了“哥本哈根车轮”——革命性新式自行车轮,不仅能提供能
For a big country like China, this magical wheel may have huge business opportunities. During the climate conference in Copenhagen, MIT researchers showed the “Copenhagen wheel” - a revolutionary new bicycle wheel that can not only provide energy.