In China, people who travel on official business usually keep all kinds of tickets for transportation and accommodation and stick them neatly in the unit’s account book for reimbursement by the finance staff after they return. These tickets come from the stacks of account books in the last century, soak the glue on top of the tickets with hot water, remove the tickets gently, wash and flatten them to dry, and we get these memories that have been forgotten by the times ……