你可以从一个用完的牛奶盒中切下一张长方形硬纸板，然后你还需要一根筷子和两条橡皮筋。
You will need a rectangular piece of cardboard, which can be cut off of an old milk container, a stick, and two rubber bands.
你可以从一个用完的牛奶盒中切下一张长方形硬纸板，然后你还需要一根筷子和两条橡皮筋。
You will need a rectangular piece of cardboard, which can be cut off of an old milk container, a stick, and two rubber bands.
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