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Riding bike is a healthy exercise, but can also cause some dangerous. The seat is too high to make people comfortable, accident prone. Due to the absence of relevant indicative mark, the rider needs to adjust the seat height many times to achieve the best The design will be highly interval appropriate to be marked, easy rider a one-time adjustment also contribute to the next adjust memory reference.
Wang Yiming;Xu Tianning;Guan Hongyue;Kong Ying