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Paper cup is such a common product in our daily life. When we use them with our friends, we usually cannot tell which is yours and others. "It's my cup"can help you recognize your cup just by ripping several small pieces of paper on the edge of the cup. You can also make your tea bag string around one of those pieces to prevent it from slipping into the cup.
Zhu Yao Wang Shuo He Hao Su Ao