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2015-06-04T20:24:34+08:00
As you pull down the balloon the two small balloons that represents the lungs will expand

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2015-06-05T16:50:58+08:00

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As you pull down the balloon that two small balloons expand, because of the air pressure inside,which increase the space inside the bottle, and the outside air will enter through the tube which make the two small balloons expand.
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