『新东方在线托福听力』为托福考生准备了ETS托福TPO/Official 25 Con 2听力练习，Official 25 Con 2原文答案解析，Official 25 Con 2听力原文练习音频翻译。

托福TPO/Official 25 Con 2听力原答案解析-音频翻译-新东方托福官方网校手机版

旁白：听一段学生和他生物学教授的对话。

Narrator: Listen to a conversation between a student and his biology professor.

学生：你知道的，我正在写论文，关于鲸鱼以及它们游过海洋时所采用的路径，它们的迁徙模式。

Student: Well, you know, I am writing that paper about whales and the path they travel as they swim through the ocean, their migration patterns.

学生：我正在思考这个，然后我意识到我不太了解它们在水下面是怎么屏住呼吸的。

Student: And well, I was thinking about it and I realized I don't understand how they hold their breath underwater.

这对我来说，在不知道它们是如何长时间呆在水下，描写它们的迁徙模式太过疯狂了。

It's a little crazy for me to be writing about migration patterns without actually knowing how they stay underwater for so long.

教授：你有没有做点研究去发现他们是怎么做到的呢？

Professor: Did you do any research to find out how they do it?

我在网上搜索了一下，网上有很多鲸鱼的信息，它们的栖息地，他们交流的方式，你知道的，他们的歌。

I searched on the internet and there was a lot of information about whales, their habitats, the way they communicate, you know, their songs.

但是，如果那里有任何关于他们怎么屏住呼吸的，我应该是错过了。

But if there was anything about whales and how they hold their breath, I missed it.

事实上，我有很多信息，有点受宠若惊。

Actually, I have got so much information, it's a little overwhelming.

教授：我很意外在那些书里面没有这些信息。

Professor: I am surprised there is nothing about it in any of those books.

学生：老实说，到现在为止，我只略读了一下。

Student: Well, to be honest, l've only skimmed them so far.

教授：好的。我知道我鼓励课上的每一个人去看大量的资源，但是我不想要你们受到打击。

Professor: OK. I know I encourage everyone in class to look at a substantial number of sources, but I don't want you to get overwhelmed.

查看大量资源可以给你们很好的知识基础，但是学生在完成每一篇论文的时候只有有限的时间。

Looking at a number of sources gives you a good knowledge base, but students only have a limited amount of time to work on each paper.

我不希望你为了这一个作业，去读一打书。

I don't expect you to read a dozen books on whales for this assignment.

教授：你知道的，既然你已经在这儿了。

Professor: You know, since you are already here.

我可以快速总结一下鲸鱼在水下是如何屏住呼吸。

I can give you a quick summary of how whales hold their breath underwater.

这只是他们身体上的某些适应性，尤其是他们的循环系统。

It's just a matter of certain adaptations in their anatomies, specifically in their circulatory system.

学生：所以血液循环使得差异产生？

Student: So the blood flow is what makes the difference?

首先，比起其他哺乳动物，血液占到鲸鱼体重更大的一部分。

First, blood makes up a larger share of a whale's weight than in other mammals.

学生：所以他们可以储存更多氧气，因为有更多血液？

Student: So they can store more oxygen because they have more blood?

教授：是的，但是那只是一部分。

Professor: Yes, but that's only part of it.

比起陆地动物，它们在血液中储氧的能力更加强大。

They also have a greater capacity than land animals to store oxygen in their blood.

学生：那么储存更多的氧气又是如何帮助他们在水下呆的更长的呢？

Student: So how does having more oxygen in their blood help them stay underwater longer?

教授：是鲸鱼血液将氧气带到身体其余部分的方式。

Professor: It's the way the whale's blood carries oxygen to the rest of its body.

当鲸鱼在水下时，它们很小心地用多种方式保存他们的氧气。

Whales carefully conserve their oxygen when underwater in a couple of ways.

当一个鲸鱼潜水时，它的代谢速率降低，使得心跳减慢。

When a whale dives, its metabolic rate drops, causing its heartbeat to slow down.

并且流动到它的筋肉以及一些非要害器官的血液被切断，比如它的肾脏。

And the blood flow to its muscles and some of its non-vital organs, like its kidneys, is also cut off.

一个鲸鱼的肌肉和非要害器官可以在无氧情况下工作一段时间。

A whale's muscles and non-vital organs are able to function without oxygen for an extended period of time.

学生：我明白了。现在我可以集中经历于我的话题了。

Student: I see. Well, now I can concentrate on my topic.

Why does the man go to see the professor?

What is the professor's attitude toward the man's question about how whales hold their breath?

Why does the professor mention the limited time students have to complete their papers?

According to the professor, how does a whale conserve oxygen while underwater?

Narrator 
Listen to a conversation between a student and his biology professor. 
Student 
Well, you know, I am writing that paper about whales and the path they travel as they swim through the ocean, their migration patterns. 
Professor 
Yes. I remember. 
Student 
And well, I was thinking about it and I realized I don't understand how they hold their breath underwater. lt's a little crazy for me to be writing about migration patterns without actually knowing how they stay underwater for so long. 
Professor 
Did you do any research to find out how they do it? 
Student 
Yeah, I did. I searched on the internet and there was a lot of information about whales, their habitats, the way they communicate, you know, their songs. But if there was anything about whales and how they hold their breath, I missed it. I've got a bunch of books. Actually, I have got so much information, it's a little overwhelming. 
Student 
Well, you know, I am writing that paper about whales and the path they travel as they swim through the ocean, their migration patterns. 
Professor 
Yes. I remember. 
Student 
And well, I was thinking about it and I realized I don't understand how they hold their breath underwater. lt's a little crazy for me to be writing about migration patterns without actually knowing how they stay underwater for so long. 
Professor 
I am surprised there is nothing about it in any of those books. 
Student 
Well, to be honest, l've only skimmed them so far. I am still working on finding sources. 
Professor 
OK. I know I encourage everyone in class to look at a substantial number of sources, but I don't want you to get overwhelmed. Looking at a number of sources gives you a good knowledge base, but students only have a limited amount of time to work on each paper. I don't expect you to read a dozen books on whales for this assignment. Focus on just a few. 
Student 
Ok. Thanks. 
Professor 
I am surprised there is nothing about it in any of those books. 
Student 
Well, to be honest, l've only skimmed them so far. I am still working on finding sources. 
Professor 
OK. I know I encourage everyone in class to look at a substantial number of sources, but I don't want you to get overwhelmed. Looking at a number of sources gives you a good knowledge base, but students only have a limited amount of time to work on each paper. I don't expect you to read a dozen books on whales for this assignment. Focus on just a few. 
Student 
Ok. Thanks. 
Professor 
You know, since you are already here. I can give you a quick summary of how whales hold their breath underwater. lt's just a matter of certain adaptations in their anatomies, specifically in their circulatory system. 
Student 
So the blood flow is what makes the difference? 
Professor 
Yes, and in a couple of ways. First, blood makes up a larger share of a whale's weight than in other mammals. 
Student 
So they can store more oxygen because they have more blood? 
Professor 
Yes, but that's only part of it. They also have a greater capacity than land animals to store oxygen in their blood. 
Student 
So how does having more oxygen in their blood help them stay underwater longer? 
Professor 
It's the way the whale's blood carries oxygen to the rest of its body. Whales carefully conserve their oxygen when underwater in a couple of ways. When a whale dives, its metabolic rate drops, causing its heartbeat to slow down. And the blood flow to its muscles and some of its non-vital organs, like its kidneys, is also cut off. A whale's muscles and non-vital organs are able to function without oxygen for an extended period of time. 
Student 
I see. Well, now I can concentrate on my topic.