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It solve the problem of illumination。The balloon is made by phosphors，it absorb the light in the
sun then emit light in the night. The shiny balloon is easy to take when it is flat and it can give
many times of lightness after it become big.
It is not only used to give lightness, it is also used to decorate the house to improve the atmosphere.
Jin Li , Yuliang Chen , Xingmou Han , Wenfeng Zhang