如何发射橡皮圈

这一部分将教你如何在不借助别的工具的条件下，将橡皮圈射出半米远。

1. 

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   1
   用大拇指指尖勾住橡皮圈。一定要让橡皮圈和大拇指垂直，否则的话，橡皮圈可能会被弹回来。
2. 

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   2
   用另一只手的食指和大拇指捏住橡皮圈的另一端，然后水平拉到右臂中央的位置，如果是用右手拉橡皮圈，那就拉到左臂中央的位置。
3. 

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   3
   松开食指，发射橡皮圈。
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