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When we drink water, water-drop will often flow along the cup edge to the desk. Sometimes papers on the desk will be spotted by the dirty cup.
Our design is to set a protuberant outside the cup. When the water-drop flow down and encounter the protuberant, it will go down with the protuberant. Thus, water-drop will disappear slowly in the process of sliding. That is water-drop slides. The protuberant will bypass the cup handle. And it is also easy to wash.
