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297页（210字）
指文章或说话平淡无奇，重点不突出，例他的演说只是平铺直叙地讲述一些众所周知的理论，使人听了十分厌烦。
His talk was spoken in a flat，dull style on theories commonly known and was extremely boring to the audience．