2. Advantages: complete explanation. Explain the content of the textbook comprehensively, so that the important and difficult points must be solved, the doubts must be answered, and the expansion points must be discussed, which is convenient for students to learn by themselves. Materials and Methods: Catch the latest science and technology related to the content of teaching materials in time, so as to synchronize the new science and technology with teaching; Collect the latest trends of the author's works in time to synchronize the new trends with teaching; Keep abreast of the latest education and teaching methods, so that the new methods can be synchronized with teaching. There are many expert consultants. The members of the expert advisory group of this series of books cover 16 famous education experts at home and abroad, which are distributed in more than ten provinces, autonomous regions and municipalities directly under the central government, providing a strong guarantee for the scientific and practical nature of this series of books.