In many classrooms, written communication takes place using the traditional method of pen or pencil on paper. We must underline the titles of books when writing this way. Underlining clearly shows that special attention should be given to the underlined information (in this case the book title)....
11. Italicize (or underline) titles of books, plays or feature films; use quotation marks to indicate titles of poems, stories or articles. 书籍、剧或影片的名字用斜体(加下划线)用引号标明诗歌、篇小说或文章的标题。 italicize 英英释义 verb ...
I will suggest that the reason people still underline is that many of the results of googling “manuscript format” state most firmly that to italicize is to err. Author! Author! » Blog Archive » How to format a book manuscript properly, part III: yes, the details matter. Really, re...