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Barrel is the necessities in daily life to store water. When the barrel out of use. we are usually going to stack them up. You will find it hard to unstuck the barrel because of the pressure inside the barrel less than the atmospheric pressure. To solve this, we design two salient point locate at inside of the barrel. So the diameter of the barrel is extended by the two points. Then there is interval between the two barrels available for the air flowing.
The Art And Design College,XiaMen,
Excellent design institution
Jun Li, SiYing Yu, BinBin Liao, TingFang Zeng,