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There is a list of date on every packet, but many consumers cannot find the date of manufacturing, or even do not pay attention to it. It gives the merchants a loophole and does harm to customers good.
Opening with date is designed for this problem. When removing the opening, people are easy to find there is the date of manufacturing on it, and it will help every customer to figure out whether the production is overdue.
Sui Tingmeng, Xie Yasong, Chen Chao, Ye Wenjin,