I was deeply moved by the story of two children arguing about Japan. Children are innocent and lovely, and they are very good at exploring natural phenomena. According to their observation, they expressed their opinions and started a debate. However, Confucius, the most knowledgeable and sacred teacher, could not answer their questions. Lian Xiao, two children, said, "Who is Zhihu?" . Visible knowledge is endless. Only by constantly learning and exploring the mysteries of nature can human beings understand, transform and benefit nature. After reading it, I know that I can draw different conclusions from different angles. To sum up, what you know is what you know and what you don't know is what you know.