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"Thin and Think Cup" is one kind of cup with the subtle changes on the thickness of the walls of cups, which could solve many problems above. Gradually changing the thickness of the wall of the cups makes that the stacking cups couldn't be tightly jointed together, and there is a certain gap between the walls of the cups. This could make that not only the residual water in the cup outflows completely, but also the cups is easy to separate. At the mean time, it is also easier to achieve precise control when the water issues from the thinner edge of the cups.