分行排列、尾韵、格律等是诗歌区别于其它文学类别的主要外在表现形式。从传统的研究角度看，诗歌的这些“外部”手段对诗歌内含的意义本身几乎没有什么影响，即形式与内容的高度独立。但事实上，许多诗人正是利用了诗歌特有的表现形式对他们所要转述的内容或表达的思想施加影响，甚至这些表现形式本身就是内容的重要组成部分。 The arrangement of branches, tail rhyme and metrical pattern are the main external manifestations of poetry different from other literary categories. From a traditional research point of view, these “external” means of poetry have little effect on the intrinsic meaning of poetry itself, that is, they are highly independent of form and content. But in fact, many poets exploit the peculiar manifestations of poetry to influence the content they are telling or the ideas expressed, even though they are themselves an important part of the content.