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1.一个一端开口一端封闭的纸筒,把乒乓球放在开口处。2.用力向筒里吹乒乓球,球反而滚出来了。
1. One end of the closed end of the open paper tube, the pingpong on the opening. 2. Forcibly blowing the ping-pong ball to the barrel, the ball rolled out instead.