OrvilleandWilburWrightwerethetwoAmericanbrothersthatinv...
問題詳情：OrvilleandWilburWrightwerethetwoAmericanbrothersthatinventedthefirstairplane.Theystartedoutasbicyclerepairmen.Soon,theybecameinterestedindifferenttypesofmachinesandbegantolearn 41 th...