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陀螺是一种古老的玩具，早在公元前几千年就存在了，不过最初是陶制的。
现在小孩子们玩的陀螺有木制的，塑料的，有的带抽绳，有的还有按钮。
今天来看看这种自动陀螺怎么玩吧。
Playing with an automatic spinning top 玩自动陀螺To use the automatic top is quite easy.玩这种自动陀螺很简单。
You just clip the top by the clamp, or grip, that goes with the toy用玩具里带的夹子夹住陀螺，and pull the string on the handle forcefully several times, then let go of the top.用力快速拉几次手柄上的绳子，然后释放陀螺。
When you release the top, the top will land and go spinning.当你松开陀螺，它一落地就转起来了。
And as it spins, multi-colored lights flash on and off.陀螺一边转，一边闪着五颜六色的光。
As Newton said, objects in motion stay in motion.就像牛顿说的，运动的物体会保持运动。
They don't change direction or slow down without the application of an outside force.除非施加外力，物体不会改变方向或减速。
In fact, a well-balanced top that is spun perfectly upright would spin for quite a long time.事实上，一个平衡良好的竖直旋转中的陀螺，能转很久。
If you touch it, it would lose balance instantly.如果你碰它，它就会立刻失去平衡。
Try releasing a spinning top on a smooth surface for the least amount of friction.尽量在光滑的表面玩陀螺，把摩擦力减到最小。
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