Read the article "burden"

First straw sandals send cloth shoes, then straw sandals send sneakers, and then straw sandals send leather shoes. You can wear shiny leather shoes all year round. This means that the leather shoes man turned the source of this road into his distant hometown. This mountain road is difficult for his father to walk. Later, when he arrived in the town, many villagers were afraid that his son would be accused of being an unfilial son, and everyone in the town laughed. So this is a long and desolate mountain road. Leather shoes man is willing to pay for his son and come back once. It's only a year or two. It means that his father worked hard to raise his son to be an official and then went back to his hometown less often.