Cover: The cover of genuine books is often positive color with good quality.
Binding: Genuine books with more than 200 pages should be bound with sewing thread, plastic thread or wireless. However, due to the limitation of printing and binding equipment or in order to reduce costs, pirates still use wire binding for books with more than 300 pages.
Paper: Double-sided printing of books requires a certain thickness of paper, and the original book paper is generally more than 52 grams. If you encounter a book with thin paper and the handwriting on the other side is exposed, it may be a pirated book.
Read the text of this book carefully.
There are few typos, other words, variant characters, derivatives and sick sentences in the original book, and the typesetting is neat. Although pirated books are copied according to the original, they will cause more ink spots on the paper, and the handwriting is fat and easy to distinguish.