A math book.
Book is an English word, which translates as "book, volume, textbook, account book" when used as a noun, and means booking, registering, and making an appointment (going to a hotel, restaurant, theater, etc.) when used as a verb. ), file a case (sue someone) and conclude a performance contract. When used as an adjective, it is translated as "from books, books, books (or from books), books or books".
Examples of bilingual books:
Both he and she like this book.
Both he and she like this book very much.
How I like this book!
How I like this book!
3. In one book after another, from one place to another.
In book after book, from one place to another.