Preprocessing tokens can be separated by white space; this consists of comments (2.7), or white-space characters (spaces, horizontal tab, new-line, vertical tab, and form-feed), or both.

• 预处理标记被空白分隔，空白由注释（2.；7），或空白字符（空格，水平表格，换行，垂直表格，和换页），或者由两者共同组成。