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Seesaw is a popular plaything favored by many people from the elderly to children. what if storing the energy while playing? This is just a new seesaw which can storing the enery while you going up and down,in addition, it can be used as a street lamp in the evening.
Wang Lei Yang Xiao Fu Yueming Gui LIN Rao Yu Li Yan Fang Yao Chen Si Zhan Yangyang Chen Chen