OrvilleandWilburWrightwerethetwoAmericanbrothersthatinv...
问题详情：OrvilleandWilburWrightwerethetwoAmericanbrothersthatinventedthefirstairplane.Theystartedoutasbicyclerepairmen.Soon,theybecameinterestedindifferenttypesofmachinesandbegantolearn 41 th...