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dam of cup / dam of cup

dam of cup

In our daily life,when we twist off the cup's cover
to drink water,the water in the cover would be
sprinkled on the desk,books or somewhere we don't
want it appear.We add a ringed structure to the inside
of the cover to solve this problem.

Design

Shaanxi University of Science Technology

Shaanxi University of Science Technology
xian, China