A rechargeable battery is arranged between a bicycle saddle and a back wheel.
2
橡胶坐垫由橡胶层、布基型锡铂纸(面层)和弹簧骨架组成，适合于摩托车、自行车在夏季使用。
The rubber mattress consists of rubber layer, cloth-based silver paper (as a cover) and spring skeleton and is mainly used for motorcycle and bicycle in summer.
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