如何展开雅思大作文主体段(3)

　　这篇文章是关于上大学前是否应该用一年的时间来旅游或者工作进行论证。此段的主题是学生在进入大学学习之前花一年时间进行旅游或工作的话，会让他们受益匪浅。对比点是：进入大学之前一年进行旅游或工作有利于让学生广泛了解社会，加深他们对外界的理解，因此能让他们更好地协调好学习目标和社会的需要。相对比之下，直接进入大学学习的话，他们不能够把握学习的方向，而且有可能会产生理论和实践相脱节。通过此番对比，旅游或工作一年对于即将步入大学的学生们的好处是显而易见，段落的主题句得到有力的论证。

　　四、通过假设进行正反论述。

　　Then, since the transportation system is the lifeline of a country’s economic activities, its paralysis would lead to the disintegration of the economy, either industry of farming or daylife. Suppose all the means of transportation were halted for lack of oil, factories with insufficient raw materials would have to close, workers would be out of work, and ripe farm crops would have to stay in the fields at the mercy of rain and storms. People would try to store food and the price of all commodities would go up. If we take those power stations run by oil into account, situations would become even worse. In this sense, oil decides the fate of the whole economy and that of the government。

　　通过假设得出了一系列的可怕的后果，最后再得出结论，这样的结论是发人深省，当然也是最能引起人们广泛重视的。

　　五、换种说法，换而言之。

　　The computer technology has no doubt at all replaced most of function, that is, we can read books from the academic database; newspapers and publishes from almost everywhere, this means that we do not need many hard copies and environment friendly for the earth. However I am not so much convinced that public libraries can replace other functions that we need other than providing information or books。

　　换而言之就是换种方式去解释，使解释更加具体直观话，因而更能被理解并接受。