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When people wash the cup in daily life, it is usually difficult to make it clean totally because the high cup wall and the bottom are linked to form a corner. The up-down cup has alternative bases instead of integrated cup body. Users can match the cover to either side as they like. The intermediate plug is leakage- proof. And more essentially, this cup is easy to wash ,dry and clean.
Hu Nan University
Zhang Haolin Cai Zhiwen Ding Kebi Xu Jiayang