VOA慢速英语(翻译+字幕+讲解):蓝鲸为何体型庞大?气候变化是祸首
日期:2017-05-25 16:42

(单词翻译:单击)

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听力文本

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When Did Whales Get So Large?
This is What's Trending Today...
Three million years may seem like a long time. But when you consider that planet Earth is more than 4.5 billion years old, it is a pretty short period of time.
And it is over that shorter time period that the whales in our oceans today got to be so large.
The blue whale is the largest animal that has ever lived. They weigh more than even the biggest dinosaurs. They can grow to 30 meters long and weigh up to 130,000 kilograms.
Blue whales are part of the baleen whale family. Baleen is a kind of food-filtering structure in the mouths of the whales. The whales developed this system about 30 million years ago.
Other whales in the baleen family include fin whales, bowhead whales, and right whales. Today, these whales can weigh well over 70,000 kilograms.
But for millions of years, they were not nearly that large, scientists say.
"All of a sudden – ‘boom' – we see them get very big, like blue whales," scientist Nick Pyenson told the New York Times. He and other researchers recently published an article on whale size in the British research journal Proceedings of the Royal Society B.
"It's like going from whales the size of minivans to longer than two school buses," Pyenson added.
The researchers -- Pyenson, Jeremy Goldbogen and Graham Slater -- believe that a change in the Earth's climate caused whales to get so large only about 3 million years ago.
This change led to food becoming more easily available.
An oncoming ice age made the ocean water cold. High winds mixed the water in the ocean faster than before. Rain and snow made more nutrients run off from the land into the water. The nutrients resulted in algae. That attracted small fish and shrimp called krill.
The mixture of nutrients resulted in more food for large whales to eat.
Whales that were able to quickly eat a lot of food survived. And they got larger. Whales that had teeth instead of baleen, however, did not survive.
The largest baleen whales then produced other large whales.
Over the next three or four million years, the baleen whales grew 10 times bigger than they had been, the researchers say.
It is possible that the largest whales are gone, the researchers said. But, as they told the BBC, blue whales could grow even bigger -- or they could slowly die – depending on Earth's changing climate.
And that's What's Trending Today.
I'm Dan Friedell.

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词汇解析

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1.depending on 根据;取决于

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I tend to have a different answer, depending on the family.
根据家庭的不同,我往往会给出不同的答案fh1e1&PiVE2D

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2.instead of 代替

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Instead of snacking on crisps and chocolate, nibble on celery or carrot.
不要把薯片和巧克力当零食来吃,要吃些芹菜和胡萝卜.W#(|VjgF+P

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3.run off 逃跑

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The last thing I'm going to do is run off with some-body's husband.
我绝不可能和别人的丈夫私奔QRO*aUc&~2X

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4.High winds 狂风

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High winds have knocked down trees and power lines.
狂风刮倒了树木和电线]^r#tJG%m_F-9sT7Gkv

内容解析

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1.But when you consider that planet Earth is more than 4.5 billion years old, it is a pretty short period of time.

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a short period of time 短时间;短期内

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I have never seen such a seismic shift in public opinion in such a short period of time.
我从未见过公众舆论在如此短的时间内发生如此巨大的转变d5O|bJa9i_~
How could you do it in such a short period of time?
你是怎么在如此短的时间里做到的?

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2.The mixture of nutrients resulted in more food for large whales to eat.

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resulted in 导致

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The speech has resulted in a firestorm of controversy.
这一讲话已引发了激烈的争议FePuRlZ[B|*DX#+@l@pu
The boom in building has resulted in the local land being more valuable now for houses.
营造业的兴旺导致了目前当地房屋建筑土地价格上涨q^3DTWJfg=

参考译文

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蓝鲸为何体型庞大?气候变化是祸首
这里是《今日热点》节目9KU|1ABYVTQm#y
300万年看似时间很长,不过跟地球45亿年的年龄比起来,可谓是大巫见小巫了4&EX1-9Iyzy
在这么短的时间内,现存于海洋中的鲸鱼体型进化得如此庞大d,8;Gz5PF(9|QA2kC5iM
蓝鲸是有史以来体型最大的动物,它们的体重甚至超过最大的恐龙OEFX3W0qKsNn!xK。蓝鲸身长可达30米,体重可达130吨F*5sy&P!uaLR3

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鲸鱼体型庞大.jpg
蓝鲸属于须鲸CKk85KC8_[YaTWBSD@O。鲸须可以过滤鲸鱼口腔内的食物bjS|&iEk3#3W5。3000万年前,鲸鱼进化出这一过滤系统TWp.b)qc6Q-OX1G&s-
其它须鲸类鲸鱼还包括长须鲸、弓头鲸和露脊鲸ttw1,7&KobVSH0;W。现如今,这些鲸鱼的体重远超过70吨Up%6,[KM7kBjJyQk5ZN
然而科学家表示,数百万年前,鲸鱼并没有这么大UCT-jEO,5MlCKs^Ce3sP
科学家尼克·派森(Nick Pyenson)对《纽约时报》表示,“突然之间,它们的体型像蓝鲸一样发生了巨变*fWvM3_8o8_b]v+;vm。”近日,派森和其它研究人员在《英国皇家学会会刊B辑》上发表了一篇关于鲸鱼体型变化的研究oEEB,J(0NwJb*
派森进一步解释称,“鲸鱼的体型就像从一辆小货车进化为两辆校车K(jz5UM+.NJ2i*!p4N]Y。”
研究员派森、杰里米·葛保根( Goldbogen)和格雷厄姆·斯莱特(Graham Slater)指出,大约300万年前,地球的气候变化导致鲸鱼体型发生巨变-|eAUJC,-aoGh*7
这一进化使鲸鱼更容易捕食wyh*Qs[mZ(]r%fJ
即将来临的冰河时代导致海水温度骤降tk0c~I)1igt;ed*&hm。狂风使海水流动得更快jIeVd2iwP%#qCR。雨雪夹带着陆地上的营养物质流入大海-K@wwDPDi_7Df&Y。这种养分滋生了藻类,进而吸引了鱼虾q~X2(2EQYwuQKn9_
这种混杂的养分补充了鲸鱼的食物链odh1%e0PrdrV=,QJ6I
那些快速补充大量食物的鲸鱼得以存活,它们的体型也愈加庞大[FxTEeg],ty。而那些有牙齿但没有鲸须的鲸鱼被环境淘汰Q2eu@|o6,nLId9sxn
之后,这种最大的须鲸繁殖出其它大型鲸鱼j=z*vR]F[3xyX&-w2J
研究人员表示,接下来的300-400百万年间,须鲸的体型比原来大了10倍u&5r^siE%R
研究人员表示,这种最大的鲸鱼有可能消失uV|ut!DW&;-@(VH_)。不过正如他们对英国广播公司所说,蓝鲸是继续进化还是逐渐灭绝皆取决于地球的气候变化#T854My5A~!
以上为《今日热点》a0oCYBSIcY
丹·费里德尔为您播报fYhD,~zm6G.MJJ;O0X&

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译文为可可英语翻译,未经授权请勿转载!

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