其中，第一张图显示了正文内容超过了中心句内容；第二张图则相反；第三张图中正文内容与中心句题才是相吻合的。(*号表示在双边型结构的文章中没有主体段的第三段。)

接下来我们通过实例来了解中心句， 主题句与总结段的布置。比如：

Topic1: Is it not necessary to learn the skill of cooking due to the success of convenience food and read-made meals?

Thesis statement: But in my opinion, cooking is a very important ability we should not lose。

Topic sentence 1: First of all, the fact is that ready-made meals are not usually that good for us。

Topic sentence 2: Moreover, it is extremely important for children to learn how to cook, so that they will be fully independent when they grow up。

Topic sentence 3: Speaking personally, I have always enjoyed experimenting in the kitchen, by cooking slightly unconventional meals。

Conclusion: In conclusion, although some use of convenience food is natural, no one should rely on it exclusively at the expense of home-cooked food. Not only is this unhealthy but it is also threatening important skills with extinction。

Topic 2: Who should be responsible for our old people?

Thesis statement: In my essay I would like to note four different models。

Topic sentence 1: Firstly, the company can be responsible for their retired employees。

Topic sentence 2: A second solution is that the government has to have the responsibility for the old people’s care。

Topic sentence 3: Another way of solving this problem is to give back the responsibility to the individual。

Topic sentence 4: A last solution is to go back to the old model of the big family who cares for all their members。

Conclusion: To sum up I have to admit that I can’t find a really good solution for this problem. All models have advantages and disadvantages. Certainly we will have to go on thinking。

Topic3: Should students in high school study music as a compulsory school subject?

Thesis statement: While some think the study of music in high school is a waste of valuable school time, musical training and study is an important part of educational development。

Topic sentence 1: It is true that when it comes to the study and application of music, not everyone is suited。

Topic sentence 2: On the other hand, it is quite well-known that music can play an important part in the development of the human brain。

Conclusion: While not every student may be musically inclined, the study of music is a valuable inclusion in any student’s course of study. In addition to being excellent for mental growth and development, students of music learn discipline, persistence and patience. Music should be a compulsory part of a high school student’s education。