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The cap design is that every cap has a number which corresponds to a player's jersey number.
First, this design makes sure that every player drinks his own water because his cap number corresponding to his jersey number. Second, the five-sided structure of the cap makes it easier to be opened . Third, the cap could be as a mark of tactics board, which not only make it easy to recognize every player, but also saves lots of resources.
Southwest Jiaotong University;
Wang Jinglong Cheng Yanyan