Low Tide

Ancient book restorer Shen Yang was commissioned to restore an unnamed diary, but found that the paper came from 100 million years ago, the ink contained unknown isotopes, and the page number "8" had an extra circle. In the spiral layout of Wuchenxu Village, the more he uses rational analysis, the more it is re-layed - reading means opening, and opening means infection. After closing the book, check the number "8" you wrote.