1, the difference in quantity: "book" is used as a quantifier here, indicating the unit of quantity of books, such as one book and two books. "Ben" is also a quantifier, but in modern Chinese, it is more used to count a single object, such as one book and two books, so when we say "one book", we emphasize the number of books.
2. Differences in formality: In some formal occasions or written language, using "Book" as a quantifier is more formal and accurate. For example, in the cataloging system of the library, "book" is used to record the number of books, while "book", as a more colloquial and popular quantifier, is used more frequently in daily life.
3. Books are carriers of human knowledge and wisdom and important tools for people to learn and communicate. Since ancient times, books have been an important medium for the inheritance and development of human civilization.