The characteristics of pirated books were usually more obvious, such as poor printing quality, uneven paper, and blurred font. If you suspect that you have bought a pirated book, you can try the following: 1. Check if the book packaging is intact and if there is any damage or distortion. 2. Check if the label on the cover of the book is clear and the content is correct. 3. Check if the copyright information on the back cover of the book is the same as the one on the book. 4. Check the books for typographic errors or typographies. 5. Check if the price of the book is the same as the price of the genuine book. If you can't confirm whether the book is pirated or not, you should go to the local library or bookstore to check. In addition, he could also contact the customer service of Jingdong to ask them to help him identify whether the book was pirated or not.