"The logarithmic field transformed from the positive real number field is a 'virtual world', and the logarithmic table is the 'dictionary' between the real world language and this' virtual world 'language!" Looking back at the latest 5th edition of the textbook "Fundamentals of Circuit Analysis", many engineering students share the same feeling: from the introduction, principles, to examples, it often gives people a sense of being obedient and persuasive, combined with vivid metaphors and concise and easy to understand explanations, making abstract knowledge clear and interesting all at once. This classic textbook was edited by the late Professor Li Hansun from Beijing Institute of Technology. From the first edition in 1978 to the fifth edition in 2017, after more than 40 years and four revisions, every subtle adjustment in the book embodies the old professor's heart of educating people with punches and punches. A classic university textbook can withstand the test of time and provide inspiration and education to generation after generation of young students. Recently, the Ministry of Education issued the "Implementation Plan for the Construction of National Plan Textbooks for Undergraduate Regular Higher Education in the 14th Five Year Plan", proposing to promote universities to establish inheritance and innovation mechanisms for excellent textbooks that have been used for a long time, have a wide range of influence, and are highly recognized by teachers and students, establish a teaching material construction team that combines old, middle, and young people, innovate writing concepts, update content forms, cultivate and create a batch of classic inheritance textbooks with exemplary, authoritative, and innovative characteristics, and continuously enhance the vitality and influence of classic textbooks. In the current era of knowledge explosion, students are learning and seeking knowledge in increasingly diverse ways. How can classic textbooks in universities keep up with the pace of the times and shine with timeless charm through inheritance? 1. The content is adjusted, and the value is guided by the knowledge impartment and ability cultivation. The reporter noticed that many old textbooks, in the process of "upgrading and iteration", improved the readability of textbooks, enhanced the closeness to student groups, and more adapted to the requirements of education in colleges and universities in the new era by adjusting the logical structure, integrating the ideological and political curriculum, and adding case materials close to the present. The Tongji University version of "Engineering Mathematics Linear Algebra" is an old face in mathematics classes for engineering students. After the 7th revision, students found that there was an adjustment in the order of chapters. Why is it adjusted like this? The relevant person in charge of Higher Education Press stated, "We have fully absorbed the opinions and suggestions of multiple experts, frontline teachers, and netizens, and adjusted the chapter arrangement of Chapter 4 according to the cognitive law of 'from general to special'. First, we introduced the concept of vector space in Section 4, and then used vector space to describe the structure of linear equation system solutions in Section 5, which can make the chapter structure more reasonable and more conducive to teacher teaching." "Poverty leads to change, change leads to success, and the general principle lasts for a long time." "We do not know the true face of Mount Lu, only because we are in this mountain." In the 5th edition of "Fundamentals of Circuit Analysis," in addition to principles, formulas, circuit diagrams, lines of poetry, ancient literature, and famous works are also included in the fifth edition of "Fundamentals of Circuit Analysis." The admonitions are interspersed perfectly, cleverly revealing the scientific principles in the circuit, It also subtly stimulates students' patriotism and sense of mission. The reporter learned in the interview that when revising the 5th edition of "Fundamentals of Circuit Analysis", Li Hansun not only strives for smooth and clear writing skills, but also combines the ideological and political requirements of the course to deeply explore the ideological and political elements in teaching, highlighting "engineering education"