SAT写作议文章中， 比喻（metaphor）在议文章中是如何发挥它的说服作用的，我们今天就一起来看看吧！
什么是比喻（metaphor）
A metaphor makes a hidden comparison between two things or objects that are dissimilar to each other but have some characteristics common between them.
比喻就是“隐性地”比较两个不同事物的相似特征。比如老莎（莎士比亚）曾经就对这个世界做了一个很微妙的比喻，原句是这样的：
“All the world’s a stage and men and women merely players.”
世界就是一个舞台，人仅仅是这个舞台上的演员而已。
比喻常见的修辞效果是什么？
① 煽动情绪
…appeals directly to the senses of listeners or readers
②便于理解
…sharpens their imaginations to comprehend what is being communicated to them.
③增强视觉化效果
…adds visual intensity to…
常用句型如下：
What the author does?
●Metaphor is applied to…
●The “…” metaphor is a stylistic device that
●This metaphor…
Why he or she does it?
●…serves the purpose to make the ...ungrounded 2）…adds visual intensity to…
●…helps to dismiss…
●This helps the reader understand the complexities of…
What effect this is likely to have on readers?
● …making the audience condemn…
● Any reader who has …cannot tolerate such …
● …create a sense that…
如何用3W原则对metaphor展开深度分析？
如何使用3W原则来分析一篇议文章中的metaphor呢，我们一起看个例子吧~
原文：
Standing on the coastal plain, I was saddened to think of the tragedy that might occur if this great wilderness was consumed by a web of roads and pipelines, drilling rigs and industrial facilities. （ 原文选自：Foreword to Arctic National Wildlife Refuge）
分析：
He describes the potential destruction with an image suggestive of a predator that traps its prey in a web and then consumes it. The “web” metaphor is a stylistic device that dehumanizes the oil drilling industry. This reinforces his point that the destruction would be total and permanent.
原文如何体现3W原则
首先范文准确的描述了原文作者在此处使用了一个比喻的写作手法（a “web” metaphor），将公路、石油管道比喻成一张能够吞噬保护区的网。
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