在雅思写作的评分标准中，我们看到前两个评分标准中，均出现了对段落扩展的描述，第一个评分标准task response，指任务完成度，在文章内容方面的体现即文章是否回答了题目的关于topic的论证，是否都围绕主题，无偏题离题现象发生，能否完整全面的对话题进行论证。而第二点coherence and cohesion，指连贯和衔接，内容是否连贯，很大程度上取决于论证过程的扩展是否有紧密关联，有无逻辑性。可见议论文论证过程的合理有逻辑的扩展非常重要。
The main purpose of public libraries is to provide books and they should not waste their limited resources and space on providing expensive hi-tech media such as computer software, videos and DVDs. To what extent do you agree or disagree?
The hi-tech media should been provided by the public libraries.
Body: Ph 1 Making concession
Multimedia facilities are expensive.
Ph 2 Reason one to support my opinion.
Hi-tech media can store information much longer than traditional means.
Ph 3 Reason two to support my opinion
Visiting a library with multimedia access is much more interesting.
Conclusion: Restate my opinion
The investment is justified and should be encouraged.作者: ace雅思专家 时间: 2010-11-23 22:35
上述结构我们看出作者的观点是支持提供高科技媒体，但这个论证过程非常全面，它先在论证的第一段就退一步承认其缺点，然后再就这一点进行反驳，这个段落就是让步段，参考之前提供句型，得出这一段：
Opponents of a high-tech library would argue that multimedia facilities are expensive. This may be true to some extent, because a DVD player is often more expensive than a bookshelf. However, with immense storage capacity, these new high-tech media can actually save the most valuable resource-space.
There are social, medical and technical problems associated with the use of mobile phones. What forms do they take? Do you agree that the problems outweigh the benefits of mobile phones?
让步段在论证过程中有着相当广泛的实战意义，它可以帮助考生扩展文章的字数，达到要求，此外，它还能使得论证过程更加全面。老师推荐学生准确使用此种论证方法，希望对写作取得高分有切实的帮助。作者: ace雅思专家 时间: 2010-11-24 21:28
Thank you Aaron. Good work!