出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第299页（239字）
表示只是阐述前人的理论、学说，自己并无创见，例林教授要学生们不可述而不作，而应创立自己的新理论。
Professor Lin does not let his students expound on the theories of their predecessors but tries to get them to originate their own new ones．