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In the disposable of cup inwall add a piece of paper, making a tiny change that not only to de crease the cost of production but also it is more convenient to entertain the friends when making tea. As the characteristic of softness paper,we need’t to change the superposition of the cup.
East china jiao tong university
Nanchang city, China
East China jiaotong University
Danyang Zhang Jinpo Zhang Ranran Guo