ref·er·ence book
noun/ˈrefrəns bʊk/
/ˈrefrəns bʊk/
- a book that contains facts and information, that you look at when you need to find out something particular
参考书；工具书 - dictionaries, encyclopedias and other reference books
词典、百科全书及其他工具书
- dictionaries, encyclopedias and other reference books