同事办公桌上放着几个陀螺,几位老师饶有兴致地走过去摆弄起来。“这都是没收学生的,”这位同事边说边拉开抽屉让大家看,“这里还有很多,我们班孩子都玩疯了!”不同于我们小时候玩的用鞭子抽打的木制陀螺,这些小陀螺都是塑料制品,下部是一个尖尖的陀螺,上部是一个齿轮状的助力设施,外加一条带锯齿的塑料条。玩的时候用塑料条拉动齿轮,让齿轮带动陀螺旋转,然后分离,陀螺就会依靠惯性继续旋转。孩子们比赛谁的陀螺转的时 Colleagues desk placed a few tops, a few teachers walked with great interest to get it together. “This is a confiscation of students, ” the colleague said while pulling open the drawer for everyone to see “There are many more, our class children are playing crazy! ” Unlike the play whipped when we were young The wooden tops, all made of plastic, have a pointed top on the lower part and a geared aid on the top, plus a serrated plastic strip. When playing with the plastic pull the gear, let the gear drive gyro rotation, and then separated, the gyro will continue to rotate by inertia. When the kids turn their gyros