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This is the future of public bicycle design, the future of public bicycles can be a single person riding a bike, you can also ride three. Three people using a public bicycle can save space. When the three people use, people sitting behind turn the wheel to provide power by hand, so you can exercise your arm. When someone that around you inability to ride a bike, you can ride a bike together.
Xi`an University of Science and Tec
Xi`an, China, China