『新东方在线托福口语』为托福考生准备了ETS托福TPO/Official 34 Task 4口语练习：<img src="/upload/ti/2427000-2428000/2427276/00cb8c800f1b4731b47e87b3cb1fd058.jpg">
 
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托福TPO/Official 34 Task 4口语原文独立/综合口语题目答案解析-范文音频翻译-新东方托福官方网校手机版

旁白：来听生物课讲座上的一部分。

Narrator: Listen to part of a lecture in a Biology class.

教授：好吧，我们一直在谈论青蛙。

Professor: So, okay, we've been talking about frogs.

就像所有的两栖动物一样，青蛙的皮肤很薄，

And like all amphibians, frogs have thin skin,

这意味着它们很容易通过皮肤失去水分。

which means that they lose moisture through their skin easily.

现在，通常，我们认为青蛙生活在潮湿的环境中。

Now, typically, we think of frogs as living in wet environments.

但是对于那些生活在干旱地区的青蛙来说，这可能是个问题。

But for frogs who live in dry places with desert-like conditions, this can be a problem.

青蛙通过拥有不同的身体特征在这些地区生存。

Frogs have been able to survive in such areas by having different physical features.

特殊的干气候特征，可以帮助它们在细胞中保持足够的水分，避免干燥。

Special dry-climate features that help them maintain an adequate level of moisture in their cells and avoid drying out.

有些青蛙通过这种方式防止水分从皮肤流失。

Some frogs do this by preventing water loss through their skin.

通过在它们的皮肤上盖上一层覆盖物，

By creating a sort of covering over their skin,

它们会大大减少在干燥的空气中的皮肤暴露。

they greatly reduce their skin's exposure to the dry air.

覆盖层就像一个锁住水分的屏障。

The covering acts like a barrier that locks in moisture.

例如，一些青蛙通过它们的皮肤分泌一种物质，

For example, some frogs secrete a substance through their skin,

一种脂肪物质，他们会用手脚把这种物质涂遍全身。

a fatty substance that they rub all over their skin using their hands and feet,

在它们的身体周围形成了一个蜡质层，几乎是完全不透水的。

which creates a waxy layer all around their bodies that's almost completely watertight.

其他的青蛙通过另一种的物理特征保持足够的水分，

Other frogs maintain an adequate level of moisture through a different physical feature,

允许它们在体内储存水分以供以后使用。

one that allows them to store water inside their bodies for later use.

它们体内的一个特殊的内部器官，

A specially modified internal organ inside their bodies,

enables them to have a high water-storage capacity.

因此，青蛙能够在潮湿的雨天吸收和储存水分，

So the frogs are able to absorb and store moisture during wet rainy times,

它们可以依靠这些来度过干旱期。

which they can rely on to get through dry periods.

例如，有种青蛙被形象的命名为储水青蛙，

The aptly named water-holding frog, for example,

具有高度弹性和可伸缩的膀胱。

has a bladder that is highly elastic and stretchable.

青蛙通过它的皮肤吸收水分，它的膀胱扩张来容纳多余的水分。

the frog absorbs water through its skin and its bladder stretches to hold this extra water.

然后，水从特殊的膀胱缓慢地释放到青蛙的内部组织，直到下一场雨，

The water is then slowly released from the special bladder into the frogs internal tissues until the next rain,

<img src="/upload/ti/2427000-2428000/2427276/00cb8c800f1b4731b47e87b3cb1fd058.jpg">
 
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Using points and examples from the lecture, explain two dry‐climate features of frogs.&nbsp; &nbsp;