Thebikeisoneofthesim的精選

問題詳情：Thebikeisoneofthesimplestyetmostusefulinventionsintheworld.Whatisthemosturprisingisthatitwasnotinvented1,althoughthegreatinventorLenardodaVincihaddrawnpicturesforbikes2forflyingmachinesandsome...