ATrainFloatingOnAirAtrainthatfloatsonair?It'snotmagic―i...
问题详情:ATrainFloatingOnAirAtrainthatfloatsonair?It'snotmagic―it'smagnets.Andit'sclosetoreality. InVirginiaUSAthefallof2002,atrainwithnowheelstraveledonairandcarriedcollegestudentsacros...