用“perpetual motion machine”造句大全,perpetual motion machine造句
It'sa$500billionperpetualmotionmachine.Aperpetualmotionmachinewouldhavetobefrictionless.Makingenergylikethesundoesmighttoocheaptometerorasuneconomicalasaperpetualmotionmachine.Thatwouldthatwouldgiver...