Hello, in order to let you enjoy lower prices, all our books are purchased directly from the publishing house, and some books are also sold by the publishing house for Dangdang. Due to the different versions of the same book, the printing effect may be slightly different. Please rest assured that we can guarantee the quality of our products by purchasing through formal channels. Please rest assured that the printing factory will also change different paper and printing pigments due to different versions or printing time of books, such as the influence of the books you receive.