"Uncle, can you show me some white bags?" Xiao Yang pointed to the flour bag in the car.

"Boy, what do you want this for? It's dirty." There's a sanitation Lane in the car.

"I'm a little useful, please." Xiao Yang nodded politely to him.

The sanitation workers handed several white bags to Xiaoyang.

Xiao Yang took the bag and went back to the other three. Instead of talking to others, he looked at the bag and studied it carefully. A minute later, Xiao Yang laughed.

get it done!

At the bottom of these flour bags, the date of production is clearly written, and the date of production of flour...