"Illustrated guides are reference books. Even though they sell 10-20 % less than before, what's kept them from slipping into utter obsolescence and insolvency like the encyclopedias?"
「圖鑑書也是工具書，雖然銷量也衰退 1 ~ 2 成，但為何沒有像紙本百科全書那樣黯然退出市場？」