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With many advantages of Electric bicycles, they have been still not common and popular. The main reason is that their exterior design has not revealed its essence. Moreover, the entire bicycles give a sense of instability when the frame is fi
With many advantages of Electric bicycles, they have been still not common and popular. The main reason is that their exterior design has not revealed its essence. Moreover, the entire bicycles give a sense of instability when the frame is fi
Externí odkaz:
http://ndltd.ncl.edu.tw/handle/5se374
