ATrainFloatingOnAirAtrainthatfloatsonair?It'snotmagic―i...
問題詳情:ATrainFloatingOnAirAtrainthatfloatsonair?It'snotmagic―it'smagnets.Andit'sclosetoreality. InVirginiaUSAthefallof2002,atrainwithnowheelstraveledonairandcarriedcollegestudentsacros...