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when people put the mask into a bag or pocket,contact with one side of the face is easy to glue on the dirt.Through two-character contacts on the cable it can be incorporated to prevent pollution.
Yanshan University
Qinhuangdao, China
Yanshan University
Qinhuangdao, China
Chunlei Shi
Yajun LIu
Wei Shang
Piaopiao Hao
