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托福TPO-40 Lecture 3(上)

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Narrator: Listen to part of a lecture in an environmental science class.

请听环境科学课上的部分内容。

Professor: Now, over the next few weeks, we're gonna focus on carbon and its role in what's known as the "greenhouse effect".

教授:在接下来的几个周,我们会关注碳,以及它在"温室效应"中所起的作用。

Everyone knows what that it, right? But let's make sure anyway. Yes, Karlie?

每个人都知道那是什么,对吧?不过不管怎样,我们还是确定一下吧。Karlie,请说。

Student: The greenhouse effect is when gases in Earth's atmosphere act like the glass in a greenhouse or a hothouse.

学生:温室效应是指地球大气层中的气体起着像温室的玻璃一样的作用。

They trap in heart which warms up the earth.

它们会把热量困住,而这就让地球变暖了。

Professor: Gases like?

教授:哪些气体呢?

Students: Uh, water vapor? Carbon dioxide?

学生:水蒸气?二氧化碳?

环境科学.jpg

Professor: Right. Carbon dioxide, we hear a lot about carbon these days, no?

教授:没错,二氧化碳,我们最近经常听到碳,不是吗?

Carbon emissions, carbon burning, leaving a carbon footprint.

碳排放、碳燃烧、留下碳足迹。

So it'd be easy to assume that any form of carbon burning is necessarily a bad thing.

所以一个人很容易会以为任何形式的碳燃烧都一定是一件坏事。

But the fact is: it's not quite that simple.

但事实是:这远没有那么简单。

So we're gonna focus today on difference between good, bad and well, the, not so bad, the potentially okay carbon burning.

所以,今天我们会集中讨论一下好的、坏的、不那么坏的、可能没问题的碳燃烧之间的区别。

OK.Good carbon burning, well, we all have a personal stake in this because burning carbon is the basis of life.

好的,首先是好的碳燃烧,我们所有人在这里面都有份,因为碳燃烧是生命的基础。

We wouldn't be here if we ourselves weren't burning carbon, basically, all living things burn carbon to survive.

如果我们自己没有在烧炭,我们就不会站在这里了,基本上,所有活着的生物都需要烧碳来生存。

Usually this happens at the cellular level and what's burned is carbon in the form of sugars, glucose.

这通常发生在细胞的层次,燃烧的是糖、葡萄糖形式的碳。

Oxygen gets chemically combined with sugars in our cells and the energy produced from that reaction is then used to power the cells.

氧气会以化学的方式在我们的细胞中和糖结合,这种行为产生的能量接着会被用来给细胞提供力量。

So just by breathing you could say we are all guilty of carbon emission and contribute to the amount of carbon in the atmosphere.

可以说仅仅通过呼吸我们所有人都有排放碳的罪过,并且增加了大气中的碳含量。

Um, another thing about atmospheric carbon: it keeps us from freezing.

另一个关于大气中的碳的事情是:它能保护我们不被冻死。

Because without carbon and other greenhouse gases, our planet would be the same temperature as outer space, around four degrees above absolute zero.

因为没有碳和其他温室气体,我们星球的温度会和外太空一样,大约在绝对零度以上四度左右。

And there's nothing going on at that temperature, no possibility of life of any sort, so without atmospheric carbon, life couldn't exist on Earth.

在那种温度之下,没有任何事情能够得以进行,任何形式的生命都没有存在的可能性,所以没有了大气中的碳,地球上就不会存在生命。

Now, another thing to remember is that carbon is always being removed from the atmosphere.

要记住的另一件事是,碳经常都被从大气中清除了。

It gets used up, largely it is consumed by plant life through photosynthesis.

它会被耗尽,很大一部分都是被植物通过光合作用消耗掉了。

Also, it dissolves in the oceans or gets stored deep in the ocean.

它还会溶解在海洋中,或者被存储在深海中。

You have shellfish that use the CO2 dissolved in the water to make carbonate shells and when they die, they fall to the ocean floor and the carbon gets sequestered down there.

贝类会用溶解在水中的二氧化碳做碳化的壳,当它们死后会掉落在海床上,而碳就被隔离在那下面了。

重点单词   查看全部解释    
atmospheric [.ætməs'ferik]

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adj. 大气的,大气层的,制造气氛的

 
vapor ['veipə]

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n. 蒸汽

 
greenhouse ['gri:nhaus]

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n. 温室,暖房

 
cellular ['seljulə]

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adj. 细胞的,松织的
n. 手机

联想记忆
survive [sə'vaiv]

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vt. 比 ... 活得长,幸免于难,艰难度过

联想记忆
trap [træp]

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n. 圈套,陷阱,困境,双轮轻便马车
v. 设

 
contribute [kən'tribju:t]

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vt. 捐助,投稿
vi. 投稿,贡献,是原因

联想记忆
photosynthesis [.fəutəu'sinθəsis]

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n. 光合作用

 
assume [ə'sju:m]

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vt. 假定,设想,承担; (想当然的)认为

联想记忆
planet ['plænit]

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n. 行星

 

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