There's a big difference between the document's lengthy preamble and the actual content.该文件的长篇序文与其实际内容有很大出入。The controversy has arisen over the text of the preamble to the unification treaty.针对统一条约的序文出现了争论。The text has been revised and a new introductory essay has been added for the second edition.第二版的内容经过修订，并加入了一篇新的序文。