讲课用的textbook: College Writing Skills with Readings, Ninth Edition (美国大学英语写作第九版) by John Langan (available on jd for less than RMB70)。
这是一本不需要老师就可以自学的教科书。才两杯星巴克咖啡的价格。（我一般不光顾中国的星巴克。）
没有教科书，你只是路过看热闹。（就像我路过中国的星巴克。）
Part II: Patterns of Essay Development (短文的分类和写作手法)
Chapter 13 Comparison and/or Contrast (比较和对比式短文)
This chapter will explain and illustrate how to develop, write, and revise an essay with emphasis on comparison and/or contrast.
You are provided with two student essays and one professional essay that emphasize comparison and/or contrast.
Born to Be Different
By Camille Lewis
[You can find a link via Baidu when you search “Born to Be Different by Camille Lewis” online.]
Method of Development
Details can be presented one side at a timeor point by point.
这两种比较方式，都是科技英语写作常用的。
One Side at a Time
You can describe observational results (say the mean ocean state); then, you can describe modeling results.
科技英语写作会用这种方式。比如在一篇文章中，首先描述观测结果。然后，分析模拟结果，看它们和观测结果是否相似。
Point by Point
You can compare two datasets or two models’ outputs this way.
Developing a Comparison or Contrast Essay
Considering Purpose and Audience
Be sure to keep your audience in mind when you write.
Chapter 14 Definition (下定义式短文)
This chapter will explain and illustrate how to develop, write, and revise an essay with emphasis on definition.
You are provided with two student essays and one professional essay that emphasize definition.
Television Addiction
By Marie Winn
[You can find a link via Baidu when you search “Television Addiction by Marie Winn” online.]
Developing an Essay with Emphasis on Definition
Considering Purpose and Audience
Defining a term or an index is common in research papers.
Let’s find some papers that contain such definitions.
今天就讲这些。有问题，请留言。
如果你想提高科技英语写作能力，请跟我来...
http://blog.sciencenet.cn/blog-306792-1146577.html
