First, it's amazing that an old man in his late eighties can answer junior high school questions. Nowadays, parents often complain that their children are not the subjects of their children's school when they are in the upper grades of primary school. It is conceivable that after junior high school, especially some science subjects, they will not do it. Although they all went to school when they were children, the knowledge they learned has long been returned to the teacher. But in Ningbo, there is an old man who is nearly eighty years old, and he is still doing a good job in junior high school. It turns out that this teacher is a university professor and is very good at mechanical topics.
Second, the elderly are hospitalized because of intestinal obstruction, and they are very enthusiastic to explain the topic to their children with a stomach tube. The old professor was hospitalized because of intestinal obstruction. During hospitalization, he lived in the same ward with a junior high school boy. The little boy was worried that he would fall behind in his studies during his stay in hospital, so he asked his family to bring his textbooks and homework, and he also learned to do problems spontaneously during his stay in hospital. However, there is a difficult topic. While I was wondering, my grandfather in the same ward said, let him have a look. Who knows that the old man is very good at solving this kind of problem, he told the children.
Third, the mother of junior high school boys saw the process of the old professor explaining the topic to the children, which was very warm and recorded. Because both the boy and his mother were on the scene, they were very serious when they saw the young and old. One is talking seriously, and the other is listening attentively. It was warm, so they quickly recorded this scene with their mobile phones. It also made the majority of netizens see such a touching scene.