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After a natural disaster, there are lots victims need to be helped.
Water is one of the most important necessity to live.
We always spend lots of cost to send abundant water to the disaster area.
So we compress the water molecules to save the volume, and separate to small packages. By flapping the package, you can easily return the water inside to the original volume and drink it.
Chang Gang University
Ya Hsien Lin Hsu Mao Cheng Ssu Erh Hsu Pei Kang Sun