For example, a courier station receives 1000 items every day. The three of them come from the same city.
However, courier, it is impossible to find out which ones are in the same city directly from 1000.
After all, the same city sometimes delivers goods at different outlets. After the courier can't jump out directly, send it to another site and let the courier at another site send it. It is out of the question.
It can only be sent to the transfer station in a unified way, so that the express delivery in the transfer station can be sorted, and then the express delivery in the same place can be packaged together and sent back to the express delivery station for delivery.