上篇给大家讲了举例论证这一重要的论证方法，此篇介绍另一个很重要的论证方法
对比论证往往是对两个事物进行对比分析，或者将一个事物的正反面进行对比分析。对比论证的目的是用反面来突出正面。比如以下这一段：
Students who go to university immediately after graduation can better adjust themselves to the academic life, whereas/while those who take a gap year off are very unlikely to refocus their attention on study.
在这一段话中，作者是想突出“毕业后就立刻上大学”（正面）是比较好的做法，在说完这种做法的好处之后，又讲下“毕业后休学一年再去上大学”（反面）是不好的，以此来突出“立刻上大学”的优势，这就是对比论证。
Cities are more densely populated and there are more job opportunities available, so they earn more money. This means that they can improve living standards and afford more consumer goods than ever before. By contrast, employment opportunities are scarce in rural areas, due to the fact that many industries are underdeveloped and many inhabitants’ buying power is limited.
对比论证往往是对两个事物进行对比分析，或者将一个事物的正反面进行对比分析。对比论证的目的是用反面来突出正面。比如以下这一段：
Students who go to university immediately after graduation can better adjust themselves to the academic life, whereas/while those who take a gap year off are very unlikely to refocus their attention on study.
在这一段话中，作者是想突出“毕业后就立刻上大学”（正面）是比较好的做法，在说完这种做法的好处之后，又讲下“毕业后休学一年再去上大学”（反面）是不好的，以此来突出“立刻上大学”的优势，这就是对比论证。
Cities are more densely populated and there are more job opportunities available, so they earn more money. This means that they can improve living standards and afford more consumer goods than ever before. By contrast, employment opportunities are scarce in rural areas, due to the fact that many industries are underdeveloped and many inhabitants’ buying power is limited.