PTE写作SWT题型讲解：Near infra-red (NIR) wavelengths

各位正在备考PTE的同学们，今天给大家带来的是老师讲解版的写作SWT题型：Near infra-red (NIR) wavelengths.本篇文章将从两个部分进行分析：首先找出文章的中心句和重要句子，然后将这些句子串联起来，组成一句话、5-75个字之间的总结。

原文：

The colors that we see are a result of the light reflected within a narrow range of wavelengths -what we call the visible spectrum. But sunlight also spans wavelengths that we cannot see.

Humans can’t see ultraviolet wavelengths, which many other animals can see.

But there’s one set of wavelengths that elude all of us - these are near infra-red (NIR) wavelengths. And understanding how bird feathers interact with these wavelengths is important, not just for birds, but also for humans through the potential for improvements in thermal efficiency.

Our research in the School of BioSciences at the University of Melbourne suggests that some Australian birds can control their temperature and avoid overheating by reflecting near-infrared wavelengths of sunlight.

We collected information on 90 species of Australian birds and found a very strong link between living in hot, arid regions and reflecting a higher proportion of near-infrared light.

Researchers in the field of animal colouration have largely ignored near-infrared light, because it isn’t easy to measure and there’s no evidence that animals can see these wavelengths.

Because these wavelengths are invisible, they don’t affect camouflage or sexual attractiveness, which are very important in the animal world. This means that many animals can control their temperature by altering reflection of near-infrared light without compromising their ability to hide or attract a mate.

解析：翻译：

The colors that we see are a result of the light reflected within a narrow range of wavelengths – what we call the visible spectrum.

我们看到的颜色是光线在一个狭窄的波长范围内反射的结果，我们称之为可见光谱。

But sunlight also spans wavelengths that we cannot see.

但阳光也可以跨越我们看不到的波长。

Humans can’t see ultraviolet wavelengths, which many other animals can see.

人类看不到其他许多动物能看到的紫外线波长。

But there’s one set of wavelengths that elude all of us – these are near infra-red (NIR) wavelengths.

但是有一种波长是我们所有人都看不到的，那就是近红外波长。

And understanding how bird feathers interact with these wavelengths is important, not just for birds, but also for humans through the potential for improvements in thermal efficiency.

了解鸟类羽毛如何与这些波长相互作用是很重要的，这不仅对鸟类来说很重要，而且对人类来说也很重要，因为这可能会提高鸟类的热效率。

Our research in the School of BioSciences at the University of Melbourne suggests that some Australian birds can control their temperature and avoid overheating by reflecting near-infrared wavelengths of sunlight.

我们在墨尔本大学生物科学学院的研究表明，一些澳大利亚鸟类可以通过反射阳光的近红外波长来控制体温，避免过热。

We collected information on 90 species of Australian birds and found a very strong link between living in hot, arid regions and reflecting a higher proportion of near-infrared light.

我们收集了90种澳大利亚鸟类的信息，发现生活在炎热干旱地区和反射更高比例的近红外光之间有很强的联系。

Researchers in the field of animal colouration have largely ignored near-infrared light, because it isn’t easy to measure and there’s no evidence that animals can see these wavelengths.

动物颜色研究领域的研究人员在很大程度上忽视了近红外光，因为它不容易测量，而且没有证据表明动物可以看到这些波长。

Because these wavelengths are invisible, they don’t affect camouflage or sexual attractiveness, which are very important in the animal world.

因为这些波长是看不见的，它们不会影响到伪装或性吸引力，而这在动物世界中是非常重要的。

This means that many animals can control their temperature by altering reflection of near-infrared light without compromising their ability to hide or attract a mate.

这意味着许多动物可以通过改变近红外光的反射来控制它们的体温，而不影响它们隐藏或吸引配偶的能力。

第一部分：找出中心句

1、这篇文章说的是光，我们看到的颜色的光是在一个狭窄的波长范围内所反射的一个结果，我们称之为可见光谱。但是阳光，人类可能看不到紫外线波长，而很多动物可以看见。“But there’s one set of wavelengths that elude all of us - these are near infra-red (NIR) wavelengths. ”，这里的but转折是一个比较重要的内容。说的是有一种波长谁都看不到，就是近红外波长，人和动物都看不到。了解鸟类羽毛如何与这些波长相互作用是非常重要的，文章都写了非常重要，那这句话肯定是很重要的，我们可以把它加入答案中，可以考虑作为中心句。

2、不仅对鸟类、对人类也非常重要，它可以提高我们热的效率，这句话我们可以加入答案。接着，墨尔本大学生物科学院的一个研究证明，一些澳大利亚的鸟类可以通过反射阳光的近红外波长来控制体温。避免体温过热。

3、收集了90种澳大利亚鸟类的信息，发现生活在炎热干旱地区和反射更高比例的近红外光之间，存在着很强的联系。这个研究人员是动物着色领域的研究人员，很大程度上忽略了近红外光。因为它不太容易去进行测量。也没有证据表明动物能够看到这些波长。因为这些波长是看不见的，所以不会影响动物的伪装，或者是性吸引力，，这些东西在动物世界比较重要。

4、最后一句说这就意味着很多动物可以通过改变近红外光的反射来控制体温，而不会影响它们吸引配偶或者伪装隐藏的能力。所以这一整段其实就是在讲红外线跟这两类能力之间的事情。最后一句，它会更加的简练，所以优先摘取这一句话来作为中心句。

第二部分：重要句子串联

最后，我们将本篇比较重要的句子进行串联，构成我们的sample answer。大家要注意这个saple answer是5-75个字，有且仅有一句话。