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The bag can distinguish the freshness of food. It will display
the corresponding color according to the freshness when you
put food into it. the fresher food you put in,the brighter color it
displays. Whereas, darker. It is convenient for you to select and
purchase fresh food.
College of Science&Technology
Ningbo university
ningbo, China
lei shi,
College of Science&Technology Ningbo University
Liyuan Liu
Li Chen
Zhenwei Chen,Tingyu Chen