From 8: 00 on August/0/0, 2023 to 6:00 on August/0/4, 2023. Official website, Education Bureau of Lvliang, Shanxi, inquired that the enrollment time was from 8: 00 on August 10 to 6:00 on August 14, 2023. The subjects of the study are school-age children who are over 6 years old (born on or before August 36, 3 16) and have lishi district household registration.