1.3 The main updates of 1.1, 1.2 and 1.3 have been combined: memo structure, import and export, review schedule, formula reading, learning mode and knowledge base sorting experience have been greatly upgraded. At the same time, some major bugs and display adaptation problems that affect the basic user experience have been fixed, making adding, reviewing, knowledge base browsing and iPad use more stable and convenient.At the same time, it is allowed to pay for the user experience, instead of having to buy it to use it. The basic memo experience adds new explanation and understanding clues. When reviewing, you can turn to the memo to view the explanation, derivation, examples and error-prone points; the display ratio of picture memo and handwritten memo has also been repaired to reduce stretching, deformation and display on different devices. It shows inconsistency. The batch management, classification movement, local sharing export and import processes of the knowledge base have been enhanced, which is suitable for organizing a whole set of data or transferring memo packages to other devices. Three new learning modes have been added: high-frequency review, fragmented review and normal review. High-frequency review is suitable for pre-exam sprint; sporadic review only generates a group of memo at a time, reducing the pressure of seeing a large amount of content to be reviewed when opening the App; normal review is suitable for daily stable learning. The sporad review will now show the progress of this group. After completion, you can start another group, and prompt the remaining memo and the expected number of groups. The import experience is also more complete: you can preview the number of new additions, repetitions, formulas and pictures before importing the preset data; after importing, you can choose to start today, start tomorrow or scatter to the next few days. The knowledge base adds a new AI import style. You can choose the intelligent complete type, the exam question type or the formula key type. The JSON generated by external AI is first analyzed, checked and previewed, and then imported into a reviewable memo. Review experience adds memo lock and dynamic island countdown, which is used to reduce the false mastery of answering correctly immediately after reading the answer. When adding a new memo, you can also open it and review it after 10 minutes. Focus on learning timing has been added to the home page, and today's review rhythm has been changed to show how many articles have been reviewed in each period of time today and how many minutes have been spent. This version also optimizes LaTeX formula rendering, text memo font size, today's forgotten review, the next step after the review is completed, random order/review by knowledge base, iPad pop-up window, novice guide, language settings, add memo input experience, keyboard exit, corner mark to be reviewed and whole Body performance stability. A large number of display adaptation and interaction problems are also fixed in this version, including pop-up window size, page centering, picture proportion, review progress display, input box blank, button trigger and keyboard cannot be put away.