In a jest we can now understand why

We can now understand the meaning of the joke as sarcasm. According to the query of relevant public information, we can understand the joke as a satire, which can be used to laugh at oneself or others. The joke comes from a scholar who was about seventy years old and suddenly gave birth to a son. Because of his age, And the birth, that is, the age, and not long after gave birth to a son, who seemed to be able to study, named knowledge. The next year, another son was born, and he said with a smile, it is really a joke to have a son at such an old age, because the name is, joke, The three of them were old and had nothing to do, so they all ordered to go into the mountains to collect firewood. When they returned home, the husband asked him, which of the three sons had more firewood?