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Cross-infection and water waste often occur in the life because of taking the wrong cup. This paper cup retains the original shape advantages of disposable paper cups，and the tear-off color element for identification is added to the outer bottom of the paper cup. When using the cup, you can choose a color at the bottom to tear off a gap, to distinguish it from other people's paper cups, and avoid cross-infection of bacteria caused by the wrong cup, and to reduce the waste of water resources and other resources.