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Youmightbesurprisedtoknowthatbicycleshaveexistedforabou...
问题详情:Youmightbesurprisedtoknowthatbicycleshaveexistedforabouttwohundredyears,butnooneissurewhofirstmadethispopulartwo-wheeledmachine.36Thefrontwheelwasmuchbiggerthanthebackone,andalsothereweren'ta...