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This is an improving design of a cup, which can avoid the growth of virus thus makes our life more healthy and sanitary.
As is known, after cleaning, there will be the water drops left at the cup wall, and if we put the cup up side down, there will be more water at the cup opening. The enclosed environment provides a friendly environment of virus growth.
There are three protruding points in this clean cup. When the cup is put up side down, there will be a seam between the cup opening and the surface, and this is the same case when the cups are put in cascade.