第一段：写论文解决什么问题
1． 问题的重述
其中主要的内容是美国发的题目为主，注意叙述即可！
a. 介绍重点词开头：
例1：“Hand move” irrigation, a cheap but labor-intensive system used on small farms, consists of a movable pipe with sprinkler on top that can be attached to a stationary main.
例2:……is a real-life common phenome
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