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Tiolet paper suggested is designed to avoid the emergency when you are going to the toilet while you don't have enough paper around.By the gradient of color,it will achieve the effect of prompt.When there are only 10 pieces of paper,the color of paper will deepen gradually with the decrease of paper.according to the color ,people can get to know if there is enough paper for us to use,which avoid the awkward situation.
Dalian Minzu University
Dalian Nationalities University