perpetual motion machine

英 美
  • 永动机
  • machine n.机器;做事效率高的人;工具;车辆v.以机器制造
  • motion n.移动;动作;打手势;示意;提议;大便v.示意;运动;向...打手势
  • perpetual adj.永久的;永恒的;一再往复的
Noun:
  1. a machine that can continue to do work indefinitely without drawing energy from some external source; impossible under the law of conservation of energy