Update Question

As the author, I am a sophomore in high school. I am currently preparing for the high school academic proficiency test. One day holiday, you can only leave school on Saturday afternoon, and you will return to school in the morning of New Year's Day, but the winter vacation is approaching, and there will be two changes a day after January 17th. Although the update is getting slower and slower, the collection is getting higher and higher I am very puzzled by the phenomenon, but it is true that the winter vacation still requires two shifts a day, full attendance, here I come!