The survey shows that the sales volume of children's books in 2007 increased by nearly 25% year-on-year, becoming another high-growth module after economic management, academic and cultural books. In the national book retail market in 2007, children's books accounted for 11% Above; the sales of local original children's literary works are even more explosive, and they often occupy at least half of the seats on the best-selling list of children's books in major bookstores. What does the original mean? ["Children's books sold more than academic and cultural books.", 'Major changes in the overall structure of the book market.', "Children's book sales account for more than 20% of the retail market.", "Best-selling children's literature tends to be original."]