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breathing mask using cycle is ten days, if still use and over the life cycle. The bacteria in the mask it is sucked into the body,that is very harmful of people. The design of the mask used to the longer time which masks at the color gradually becomes deeper, it prompts the replacement masks quickly.
Zhengzhou University of Light Industry
Henan Zhengzhou, China
Zhengzhou University of Light Industry
Henan Zhengzhou, China
Jie/Zhang Yue/Zhao