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this design is a cup which could cleared by another
cup.sometime we cant wash the cup clearly. and
also we cant clear the bowel of the cup , because
of the long inter-wall.so this design sovle the pro-
blem. this cup has two part.one is the normal cup
like we always use.and the other is the soft mertial.
this mertial also prevent water too hot for your hands.
Bo Yu,Xu Lu,Jiaqi Xu,Ling Sun,Janwei Sheng,Zichuan Chen