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选择一个空墨水瓶(也可以选择其它玻璃瓶,为了保证实验效果,要选择扁的),再选择一个合适的橡皮塞,用打孔器在橡皮塞中间打一
Select an empty ink bottle (other glass bottles can also be selected. To ensure the effectiveness of the experiment, select a flat one), select a suitable rubber stopper, and use the hole punch to play a rubber stopper.