我在逛新中国儿童用品商店时,发现了个奇怪的玩具,它的结构只有一个底座、两个支架和一个形似陀螺的东西(以下简称陀螺),如图,陀螺上既看不见马达,也看不见任何动力源,可在底座上安上电池后,陀螺却能在支架上一直不停地滚,大有不到电池用完不罢休之势.乍一看陀螺并没有外力的帮助,怎么会滚个不停呢?我好奇地买下了它,准备回家探个究竟. When I was visiting the New China Children’s Store, I discovered a strange toy. Its structure consists of a pedestal, two brackets, and a gyro-like thing (hereafter referred to as a gyro). As shown in the figure, the gyro cannot see the motor. Can not see any power source, can be placed on the base after the battery, the gyro can always keep rolling in the bracket, there is less than the battery does not stop running out of the trend. At first glance gyro does not help with external forces, how Will it keep rolling? I bought it curiously and was ready to go home to find out.