英语听力：自然百科 世上最早的四足动物

 Nature's latest report from the world of paleontology challenges the assumptions made by everyone until now about when animals first walked the earth. 

 

This is footprint of early tetrapods. We have here, for example, digits¹, impressions, and something like their pads. This is important.

 

I've been working personally in this field since the mid² 1990s. I've had over 20 publications in 'Nature', and this is the most important paper that I have ever worked on.

 

Footprints in a Polish quarry³ tell the tetrapods which walked the earth 20 million years before we thought any animal had left the sea.

 

This is your little friend, isn't it? Oh my word. Oh, wonderful. Look at that!

 

Until only a few months ago, this was an accurate model of a kind of animal paleontologists believed existed in the Middle Devonian Period, with fins⁴ but no proper feet. The new model is quite different. 

 

Legs stick out and thighs⁵ can flex⁶ forwards. Then, it had to be an animal like this, a primitive⁷ land vertebrate, not a fish.

 

And if you are not sure you believe it, the Nature paper and the full film offer the proof.

1 digits   

n.数字( digit的名词复数 )；手指，足趾

参考例句：

• The number 1000 contains four digits. 1000是四位数。 来自《简明英汉词典》
• The number 410 contains three digits. 数字 410 中包括三个数目字。 来自《现代英汉综合大词典》

2 mid   

adj.中央的，中间的

参考例句：

• Our mid-term exam is pending.我们就要期中考试了。
• He switched over to teaching in mid-career.他在而立之年转入教学工作。

3 quarry   

n.采石场；v.采石；费力地找

参考例句：

• Michelangelo obtained his marble from a quarry.米开朗基罗从采石场获得他的大理石。
• This mountain was the site for a quarry.这座山曾经有一个采石场。

4 fins   

[医]散热片；鱼鳍；飞边；鸭掌

参考例句：

• The level of TNF-α positively correlated with BMI,FPG,HbA1C,TG,FINS and IRI,but not with SBP and DBP. TNF-α水平与BMI、FPG、HbA1C、TG、FINS和IRI呈显著正相关，与SBP、DBP无相关。 来自互联网
• Fins are a feature specific to fish. 鱼鳍是鱼类特有的特征。 来自辞典例句

5 thighs   

n.股，大腿( thigh的名词复数 )；食用的鸡（等的）腿

参考例句：

• He's gone to London for skin grafts on his thighs. 他去伦敦做大腿植皮手术了。 来自《简明英汉词典》
• The water came up to the fisherman's thighs. 水没到了渔夫的大腿。 来自《简明英汉词典》

6 flex   

n.皮线，花线；vt.弯曲或伸展

参考例句：

• We wound off a couple of yards of wire for a new lamp flex.我们解开几码电线作为新的电灯花线。
• He gave his biceps a flex to impress the ladies.他收缩他的肱二头肌以吸引那些女士们的目光。

7 primitive   

adj.原始的；简单的；n.原(始)人，原始事物

参考例句：

• It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
• His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。